I want to be able to control my TV and Xbox with Kinect. I really like this idea of improving TV beyond those incomprehensible guide controllers and not having it separate from the game system but rather a part of it.
I love Kinect, specially in games like Mass Effect 3 when I used predominantly my controller and Kinect to improve the experience, it just felt more personal.
The UI looks amazing, people can cry about ads and posting pictures of that shitty blades from 2008 but it just works. Getting to my games is fast, getting to my profile is fast, is well done and coherent.
The game selection just looks better to me. Dead Rising 3 and Killer Instinct look fresh and fun.
The controller looks awesome, that rumble thing will make even multiplats fresher and more immersion if they put it to good use.