Rock Band #114: WhoaGame Informer has an eight page spread about Rock Band 2 in its new issue.
Cymbals aren't included if you buy a standard drum kit, but they are available. Hi-hat, crash, and ride, I think.
If you buy the special edition Ion drumkit (where exactly do I get in line for this?), not only are cymbals included, but you can also use it as a regular e-drum kit. You can see that ten tons of sexy right here.
It's like I said: Harmonix is in my brain. That's exactly what I wanted.