BK shots look gorgeous but there are two problems I have with them:
1) there are a lot of repeating textures
2) the environments are really, really big -- almost too big -- making them seem unpopulated and sparse. (almost like, dare I say it, "Too Human syndrome")
Outside of those, both games look amazing, and if Microsoft is releasing both of them this year, 2008 will be an epic year in gaming. Gears 2, Fable 2, Viva 2, Banjo, Ninja Gaiden, Alan Wake, Too Human -- damn, this year is going to be amazing on 360. And then when you throw in PS3 software, things get even better.