Ok so I plan on getting Crysis 2 in a week or so and I'm just making sure my computer will be able to run it.

My screen resolution is 1366-768 and it would be nice if I could run it on this resolution.

PC specs:
Processor: Intel 2 Core Duo 2.53 GHz
RAM: 4 GB DDR3 (I think it's DDR3 could possibly be DDR2)
Graphics Card: ATI Mobility Radeon HD 4670 1GB


What kind of FPS do you think I'd get? 25+ would be nice.

My main target is gonna be multiplayer so is it going to run better on the multiplayer maps (due to the smaller map sizes) or is it gonna run the same on single player as it does on multiplayer?

I guess you're going to be fine, though I can't really GUARANTEE great FPS.
800x600 In a window would probably run nicely at about 30 FPS, but don't ask me.

And no, the multiplayer maps run about as good (if not worse!) than the singleplayer ones.
Well, maybe except for the very first map, which isn't that resource friendly.