Personally I see Kinect selling more systems mostly because like I've said before Sony isn't targeting anyone other than the userbase they already have. If you are a casual gamer there isn't really much reason to buy a PS3 whereas on the 360 there's Kinect for the casuals and stuff like Gears of War and Halo for the core.
Though I do agree PS3's lineup this year is incredible, I already have like 8 games pre-ordered for my PS3.