Well i think in Forza's case the AI is pretty innovative, if you have actually listened to ppl that talk about racing against these AI it seems to be awesome, and unlike anything we've seen, and those AI evolve over time.
I agree with everything else though, Ryse could end up being pure trash, but at least its beautiful and looks like something I would play through just to see, whereas Knack, I can't even begin to have interest in.
Killzone is beautiful. I think that in itself makes it a must-play game. That Killzone tech video was sweet. When they turned off the effects, the game looked like a current gen game. Killzone also has improved AI, seen a number of comments on the enemy flanking ability.
Ryse I would be more interested in if it had a better body damage system, and more varied enemy models. It may sound petty, but those are things that would make it 'next gen' for me. I see all this hacking n slashing, but never any slashing wounds on the bodies (possible I didnt' see it, I need glasses sometimes). And it would be cool to have these wounds dripping realtime bloodflow (lol). Also, kept seeing the same enemy character models like the main character was fighting an army of clones, with maybe 6-10 different models.