Will Factions interact with each other, in the sense of if you join the dark brotherhood or the thieves guild, other guilds wont accept you or something along those lines?

I hope so.

Wether not we can well that reamins to be seen. But some guids are very secretive like DB and thieves guild so they might pull off that same explanation or something.

I'm not certain if I want factions to be extremely limiting. For the sake of role-playing and immersion, it would be so awesome if you could not join the fighters guild if you were a Thief or something along those lines, but perhaps too limiting. What would be cool is if you could join just about any faction, but would have to occasionally "prove your loyalty" by doing a quest against the wishes of a competing/disliked faction. So if I was in the Thieves Guild and trying to join the Fighters Guild, I might be asked by a member of the Fighters Guild to arrest/kill a member of the Thieves Guild to prove my loyalty. Once that quest has been proposed, one of my Thieves Guild associates could approach me with a counter-offer to steal from a member of the Fighters Guild. See where I'm going with this!!!

I want them to accept eachother's prescence, and so some quests (later on down the questline) might involve killing a high-up member in an opposing faction or just plain disrupt their operations (e.g. the Hist Tree saga in Oblivion). I'd love to wander in a cave when doing a Fighter's Guild quest, and then encounter three Dark Brotherhood assassins who are doing the same job. Or maybe something was stolen from the Mages Guild and you have to track down the Thieves Guild member who did it.
You shouldn't be able to join the Fighter's Guild if you're a DB member, but since the DB is such a secretive faction then no one should actually know that you're apart of them. What could cause some drama though, is if quests within the factions appear that may harm your status with a certain faction or reveal that you are apart of an opposing faction. Although, having said this, I don't necessarily want this to turn into a whole Fallout Reputation-like thing.

i think that'll be the case. we know that the mages guild is split into to two groups now (synod and the college of whispers). so theres a chance they will be opposed to each other. it would make sense for other factions to do similar things.

Yes defiantly fractions must have better interaction then in Oblivion.

I hope the sign up for the DB is more than "You accidentally killed that one hobo so we're going to give you the golden opportunity to infiltrate our ranks."

They way I have seen it is there are two sides to factions, at least on legal terms. On the side of the law you have the Mage's Guild, the Arena, and the Fighter's Guild. On the other side of the law you have the Thieve's Guild, The Dark Brotherhood, and the Blackwood Company (unjoinable, but they would do illegal things). However, each guild has a moral opposite as well. Thieve's Guild has bandits and marauders, Mage's Guild had necromancers, and Fighter's Guild had the Blackwood Company again. The only one that didn't was the arena but the Yellow team were a bunch of cheating bastards anyways. I would like it to be split either by legality or morals. Either you can join the DB and TG, or the MG and FG. Or you can join any of those or necromancers, bandits, Blackwood Co. equivelant.

Interacting factions would be fun, like if they occasionally give you some quest that conflicts with another group. Sometimes maybe you could do some kind of more difficult path that'd keep them both happy, and others there'd be no choice but to pick one and lose some repuation/fail a quest with the other.

I think the only place where you should be barred from joining altogether because of your membership in another group would be the Imperial/Rebel factions in the civil war, if they let you pick sides there. The Fighter's Guild shouldn't even know I'm in a secret group like the Thieves Guild.

I certain hope so, give more personality to the game and that is always a welcome for me

They made mention of warring MQ Skyrim specific factions.. I:E warring kings or somesuch.
So I hope so, at least with these and not in the Good vs Evil vs Neutral GEN sense that's common these days.

As for class, job based factions I'd like it.
Again though the mages guild is gone, with at least two groups having taking over.
So as a spellcaster I'm hoping that you can have two or more to chose from.
That if you join one the other will not take you, or that to do so you have to break an oath and switch aliegence.

Same goes for fighters guilds, the one in Morrowind and the big O, were set up with an imperial decree.
Once the empire breaks down, charters do so too, new mercenary bands get set up.
I hope for the guild to be shattered and have warring factions to chose from.

Thieves guild should be the strongest, more intrigue and intercene conflicts amongst its ranks than outside faction conflicts.
Plus depth to the guards, soilders, bounty hunters involvement should be included.

Dark brotherhood were set up and kept alive by being needed, in a civil war this may or may not have changed.
It just depends on how safe they played it, did they side with the right side at the right time.
If not they could be dogs on the run in Skyrim, the weakest and most hunted faction.
With a new ruler backed assassins guild looking to take over.

Finally, I'm hoping for new, and specific minor factions.
Each city could be its own, you could have hunters lodges, merchant guilds, a nobles guild, a guards guild.. etc.

I think it should depend on the faction. Being in the Thieve's Guild/Dark Brotherhood shouldn't prevent you from joining other factions, because no one knows that you're in those factions. But if you're in a major Nord faction--assuming those factions are roughly like Hlaalu/Telvani/Redoran from MW--I think you should only be able to be in one, because 1) membership is public, so everyone knows whose side you're on, unlike TG/DB, and 2) your loyalty is uncertain.

It would be nice to get some extra recognition for being the leader of fighters and mages guild but I really don't want to have to choose between the socially acceptable guilds and the illegal ones.

I certainly hope there's some form of faction interaction, but not at all the example you gave. It was not common knowledge that my character is part of the Dark Brotherhood or the Thieves Guild, so being barred from joining any other faction would be complete BS.

I agree, being a member of secretive factions shouldn't preclude you from joining publicly known ones. That could open up some interesting dynamics as well, where quests could create a conflict of interest and some difficult choices.

However, I don't think you should be able to join every faction possible. For one, it would be totally unrealistic. If two factions are at odds with each other, why would either one of them grant you membership knowing that you're affiliated with the other one? That wouldn't make any sense.

While I'm at it, I also don't think you should be able to join friendly guilds if you don't fit the profile. The Fighter's Guild is looking for fighters, those proficient with weapons, or at least those who have potential. A mage shouldn't be able to join. A sword and shield fighter also shouldn't be able to join the Mage's Guild. Just because you know a healing spell doesn't make you a mage, and they're looking for people proficient with magic. If there's a Mercantile Guild, you can't join just to get a discount on goods. You''d have to own a shop to join it, etc. (Note to dispel misinformation: As far as I know, there has never been any mention of a Mercantile Guild, or the ability to own a shop, just using it as a hypothetical example)

I just want to see something that makes sense. In Oblivion, I was a Nightblade who could cast low-level offensive spells, and I could heal. That was about the extent of my magical prowess. Yet, I became Archmage!!!! I shouldn't have even been allowed in the door.

It seems it was a big issue for a lot of people in Oblivion, and quite honestly it removed most of the replay value.

Plus, I want a Dark Brotherhood and Morag Tong guild wars.

I do not want to be able to join every guild on one playthrough.
Once you get so far in a guild,you can't join others,within reason.
The guilds should allow you to do 1 or 2 quests for them,then from there you decide which line/route you take.
I'm actually wondering if there are more guilds now,because of the civil war,guilds could have split so there is a version on each side,so to speak.
I'm also wondering whether any of the guilds plays a part in the main quest.
I wouldn't be surprised if the dark brotherhood is involved some how. ( in the main quest )
In OXM UK it said bethesda seemed to be iching to mention the guilds ( factions ),but wants to save that for later.
To me guilds sound like they are going to be much,much better this time.
Guess we'll see soon enough

lol

That always kinda irked me as well, though I just imposed those rules on myself and limited each character I made to one Guild. My mage joined Mages guild, my rogue Thieves Guild, etc.

I don't however see joining one guild immediately limiting your ability to join another either, especially secretive ones like the DB. Your affiliation to that guild should have to be "discovered" somehow (the player should have to actively hide or cover up his activities) and it become known before the other guilds blacklist you.