The teaser trailer from the Sony E3 conference can be found below, as well as some extra in-game footage. It all looks brilliant, and I must say I even enjoy the music to the teaser trailer. I doubt Valve will mess this one up (they don’t exactly have a bad track record), and it’s all getting exciting now.

The trouble with Portal 2 stuff is that seeing too much footage ruins the puzzle aspect, since you’ll remember what to do and not figure it out on your own- which is why Valve have said they probably won’t release a demo. A shame, but like I said, I doubt there’s anything to worry about in terms of liking it. It’s a Valve game.

Backstage footage (including gameplay):

Portal 2 is coming to PC, Mac, PS3, and Xbox 360 in 2011.