As noted on GLaDOS@Home, the release of Portal 2 took place in the wee hours of this morning, just after midnight eastern time. The preorder bonus for the puzzle sequel is gone, but you can get 10% off on a two-pack, and 60% off on the Potato Sack + Portal 2 bundle.
SpectralMeat wrote on Apr 19, 2011, 11:08: Hopefully the Micro transaction stuff is in place for new levels instead of hats for your robot. I don't mind paying for new levels for this game.
Hopefully, but it doesn't look promising so far: it seems to include hats (I even received one that was carried from TF2), gestures and other mostly cosmetic things.