what I notice in the AC6 Xbox 360 screens compared to AC5 and AC Zero on PS2
*more geometry in the aircraft
*better lighting, maybe HDR?
*more 3D buildings in the cities
*better texture detail everywhere
*much greater draw-distance, seems like there's no (or little) fog to mask draw-in
*higher resolution
*less aliasing
*better color depth
keeping that in mind, with the 3x fillrate requirement to make the leap from 480i (the PS2 AC games) to 720p, while maintaining 60fps (I assume AC6 will be 60fps). also having this online is going to use up some processing power, keeping track of alot of planes & missiles, and ground units.
I expect there to be more aircraft per squadron this time. instead of the 4 planes in AC5 that comprised your own squadron and the 4-7 planes per enemy squadron in AC5 & ACZ, maybe we'll see 8 to 16 planes per squad this time. there is no doubt going to be more activity on the ground with more armored units moving around.
look at this shot, notice all the surface to air missiles being fired!
http://images.xboxyde.com/gallery/public/5111/1228_0011.jpg