From what I read it's supposed to be a pretty good game. With iirc 10-12 hours of singleplayer campaign it's longer than most shooters nowadays. The graphics are sort of a "downside" or in other words: It's not pushing itself too hard like the first Crysis did and often evens seems to fail to deliver the graphics quality of the first game. That's probably about also having the consoles as a system you need to port to and keeping the hardware requirements low (in contrast to Crysis 1 where the needed specs for high quality settings were insane)...

Gameplay wise they simplified some things (I smell console influence once again) and you now only can cloak and use the armor. I read that this isn't a very big downside though as you now play in a city anyway and the level design works in favor of this...

I cannot say much more about this - just as for the first title I don't really care about it. I'm looking forward for Duke Nukem Forever and Serious Sam 3...