Funny, I finished Crysis: Warhead yesterday. It actually doesn't look all that better than Crysis, maybe it's just an adaptation of the Cryengine 2. Not to say that it doesn't look great or anything. And I like the jungle environment.
I liked FC2's setting a lot too, but I still feel it could have been an amazing game instead of just a great one if they'd done away with some stupid hitches (or enabled mod support so we could do it). The respawning guard posts being the main thing I would change.
Anyway, looking forward to FC3. Was a great gameplay trailer.