I was way off with my Killzone prediction, so what do I know but ok I'll make some guesses......
Forza: Mid 80s. It's tried and true, looks gorgeous, and has some interesting new elements like the online drivatars, but small car and especially track count will hurt it.
Ryse: Total wild card. Could be 80+ if it has a good story, could hover around 60 if it doesn't and lacks pacing throughout. Or it could be all over the place with scores between 5-9 and an average in the 70s. It's anyone's guess at this point I think. A lot of the new previews paint a very positive picture, others are still quite negative.
Dead Rising: High 70s to low 80s. Looks like tons of fun to me. Last time I cheked, visuals are only a small fraction of a review score. Looking at some of the predictions here, I think this game will do better than most expect.
Killer Instinct: No idea. I don't play or have interest in enough fighting games to know how they're reviewed. It looks pretty fun though.