Speaking of Heavy Rain...
Saw that Quantic Dream just released a new trailer of Heavy Rain (PS3 exclusive) at Leipzig. You can check it out here. Afterward, it's worth reading a new IGN preview.
I'm definitely looking forward to this one - looks great! Will likely be the second game (after Uncharted) that I actually play for a significant amount of time on the system. That said, if you're not sure why all the excitement, check out Indigo Prophecy on the Xbox (available for download from Marketplace). First 2/3s of the game are excellent, and you'll get a sense of the cinematic atmosphere that Quantic Dream is known for.