Portal 2 comming OUT!!

Okay, so here's the deal. Portal 2 is about to hit the shelves in the stores just about a month from now on. The first one was a blast, the second one, I believe myself in Valve, supposed to be ultra blast. Now the Co-up mode should be really insane. I can't wait to test it out with my buddies. But other than that, what could really be offered more than the co up mode in portal? I mean, yeah, there can be more puzzles and levels, all the flashy stuff. However, what you think are the limits of portal? Will it be same stale just with new level, or will be something new introduced? I'm putting my hopes in Valve, I think we will find out soon! :)