Do we have information about which guilds will Skyrim have?

We know the Dark Brotherhood is back, haven't heard about anything else.

Since guilds is the topic here, I'd just like to make a quick suggestion.

BRING BACK THE IMPERIAL LEGION PLZ.

;]

We've only heard about the DB, but I would hope there are more than that.

I'd say the Mages guild will be back for sure.

There can be a several Imperial forts in the south border of Skyrim, and some legions in them, and you can join them.

Different nord clans can be join-able and they can be like great houses of Morrowind, and some of them at war with each other, and all of them rivals with each other for power, money, and resources.

Secret factions with specific goals and pledges, some of which are needed to join if you want to learn some new tricks.

Like "Necromancer" factions that could teach you a perk for Conjuration called "Necromancy" which is needed if you want to learn necromancy spells.

Same thing can happen with all the other skills which sub-sections that could require a skill perk to be acquired, which would only be acquired by joining a faction, or finishing a specific quest, or reaching a milestone, and so on...

Not much has been said about joinable guilds, but since we know of the Dark Brotherhood, I'd presume that the standard ones we've come to expect will all be in, or at least their equivalent, since my understanding is that at least the Mages Guild had split into two seperate factions at the time of Infernal City (Perhaps allowing for rival factions in that area?) but more than that, we don't know. I'm hoping that we'll at least see something equivalent to the Great Houses in Morrowind (Perhaps the factions involved in the civil war?) and some sort of temple type faction similar to Morrowind's Tribunal Temple and Imperial Cult, though I doubt we'll be able to join any Nine Divines faction even if we see people who still worship them in the game, since that would get kind of strange when you realize that Alduin and Akatosh are the same entity.