EDIT: many of the details in this post are due to be updated based on new information discovered in the E3 footage. I will either amend the post directly, or more likely will provide details in a new thread a little later on.

As many of you may know, I previously made a number of predictions regarding the pre and post-war elements of Fallout 4, several of which turned out to be surprisingly accurate. Now, based on what we have seen so far at E3, I believe I may have stumbled upon a big clue towards the storyline for the main quest. And it is HUGE! Please note, if this information turns out to be correct, then you may be reading what could end up being fairly big spoilers. Therefore please DO NOT READ if you do not wish to risk spoiling the surprise of the main storyline. For everyone else, here we go...

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In the concept art we saw at E3, we see several groups of images with a larger image in the centre. Part way through, one of these larger images shows us what looks like a ghoul pirate. A few shots later, we are shown another much larger group of images, and then there are 43 further images shown in quick succession, the 43rd one being the pre-war shot that Todd talks about. It's the images in this section, two in particular, that I want you to focus on here. The images in question are the ones in the 37th and 39th shot:

37: We see our protagonist, accompanied by his dog, and he is firing a mounted milligun from the side of a vertibird.

39: Again, we see our protagonist with his dog. This time, however, he is accompanied by a soldier in BOS power armor and the ghoul pirate we saw in the earlier image. Note the damaged airship and other aircraft that signifies a large-scale battle.

Also, in the footage shown at the Microsoft conference, we enter the "Museum of Freedom" to assist a small resistance group, which according to the leaked casting documents are actually the Commonwealth Minutemen. (EDIT: Changed this reference from Railroad to Minutemen as per casting document)

But what does all of this have to do with the bigger picture? Here is what I think happens:

37. That is my desktop background.

39. Looks to me as if the 'ghoul pirate' is actually one of the minutemen from the microsoft demo, he is using the laser musket that is their signature weapon as well.

http://fallout.wikia.com/wiki/Laser_musket

From the picture it looks as if BOS and the minutemen are the 'good guys'.

That and the footage of you signalling a Vertibird makes me think that your joining up with BOS again.

Wow, I never stopped to think that they would do these large scale battles in real-time.

I do admit I was surprised by how much you got right.

I thought the footage implied that the family made it into the vault but that you are the only survivor to make it out of it 200 years later. I could be wrong though.

Your child being a ghoul pirate sounds a bit weird and wacky. I suspect your child must play some part though, if they model it based on the two parents you design. And I feel like making him a ghoul would undermine that a bit.

What I'm wondering is what the Brotherhood of Steel is up to, cause there seemed to be footage of you fighting them, so it will be interesting to see what role they play in the story, or if that was just something for E3/unrelated to the main story.

So pretty much FO3 story different part of the family. Ugh I'm so glad we got married for that.

There are a few pictures of that ghoul and it totally looks like he is wearing the outfit of a British Redcoat not one of a pirate.

Also in the E3 trailer we saw the protagonist casually hopping into a vertibird and controlling a minigun, don't know if the concept art means anything significant. I don't think looking for your family is going to tie into the story much if at all. My bet is that when you leave your cryotube or whatever you will be aware that no one else made it.

Im sure most of us would prefer not to have the BoS show up to play the good guys (worse good guys vs enclave bad guys), even so much as playing the good guys for the wrong reasons. Im still all for the idea that the brotherhood is there to come take the institutes tech. They really be put back to their old mission and set up as morally grey option just like new vegas did with its fractions. Most of us would love to see them come in with advanced weaponry and take that **** over. Not because they are saving androids or what have you but because "the technology of the old world must not fall into the hands of savages".

Besides the old enclave armor variants, we really do not see any enclave being presented in the trailer.

If we encounter our offspring I'm shooting him/her in the face.

child is the robot armed trenchcoater

Totally didn't see that! The Kotaku document actually refers to the group as being the Commonwealth Minutemen, and not the Railroad. Although the Railroad could also be involved. OP has been edited to reflect this.

I just hope that this time the family member we get attached to, does not die mid-way because reasons.

It worked for me in Fallout 3, but I would be mighty ticked if it would be done a second time.

Your not the only one.

I remember seeing a quick glimpse of a Brotherhood character name in an enemy health bar in a scene where a vertibird was blowing up, so we might be able to choose sides?

Oh, not the Enclave again >_<

I really hope they stay dead.

I wouldn't mind fighting against the BoS (assuming it's not Lyons' Pride, they're okay in my books), or choosing between helping the BoS, The Institute, The Minutemen, or none of the above. Sort of like the NCR/Legion/House/Independent choice in New Vegas.

Considering that Enclave Power Armour isn't even listed as Enclave Power Armour, just X-01 Mk II, I don't know if the Enclave will be making an appearance... aside from where-ever the armour came from.

The possibility of being able to choose sides seems like a very viable one. Op updated.

Best case scenario in my eyes for signalling the BoS Vertibird would be to imagine it being the same as calling for NCR support in FNV; you don't have to side with them but there are badass perks to it if you do.

Given the massive amount of work put into Vertibirds I can imagine that, if we side against the Brotherhood, that they'll be someother way of utilising the feature.

You know Bethesda is hardly one for restricting major content in-games (Head of the Thieves, Assassins, Magicians and Fighters Guilds and all).

Maybe an independent playthrough (if there is one) will have your "faction" lift a few Vertibirds from the BoS and allows you to call them in as you please. Same could go with any other faction you join up with, too.

I [censored] hope so, that would be killer. The new Enclave will rise again... wonder if you can have slaves or androids in your settlements. Probably not but we can hope.

[Cover eyes] lalalalalalala..

damn it. I wish I didn't read that.

Go away!

Most likely the brotherhood will be one of a few sides we can take,

"Freedom and Liberty!
Do whatever you want in a massive open world with hundreds of locations, characters, and quests. Join multiple factions vying for power or go it alone, the choices are all yours."

Taken from amazon and its also on gamestops website as well. So we can most likely assume they are just one (non white knights pls beth dont make me beg) faction that we can side with. The others being probably the institute and the railroad.

One prediction that I made that I was especially proud of is that the game would begin Pre-War and move into Post-War via something to the effect of cryogenics.