I tried the search bar. No dice.
Learned about this last week.
I thought the first game was pretty good, but a sequel sort of came as a surprise to me.
There aren't any official trailers, only previews in magazines and a "not so revealing" gameplay video at Gamescom.
So far:
The game will have 4 new protagonists
There's only been one class that's been revealed called The Gunzerker.
Thus class is made up by Salvador the Dwarf. And his special ability is to duel-wield any(ANY) two guns in the game.
He's like the team's Brick
The old 4 protagonists will be in the game as NPC's
The game will have improved story-telling about the characters and what's going on.
Less fetch missions,
Friendly NPC's will have a BIG improvement unlike the cardboard cut outs they were in the last game.
Improved item trading between players
There will be more 4 seat vehicles for players
There's a new element called Eridium that can upgrade the player's weapons, vehicles, the players themselves, or just be sold for a lot of money.
The game is still set in Pandora
The game will be released in 2012
No sign of Claptrap so far.
That's all I know so far.
Here's a link:
http://gamescom.gamespot.com/story/6329613/gamescom-2011-borderlands-2-first-look-preview