I had a chance to play with a set in local store. Controller is massive improvement regarding rumble and grip. Simple touch of coloring the letters ABXY and not whole buttons looks so appealing. Nice to see such a beautiful UI. We (me and roommates) use 360 for TV, netflix, Play-To, and games. This will be nice upgrade, especially with UI being beautiful. I was hoping that the internals would be powerful, I want to see 4K games 5 yrs later. I do not think present internals will be able to push that many pixels. But Dead Rising 3 and Killer Instinct are addicting games. Will pick it up after Titanfall launches. I could totally connect with the use-cases shown in the video, as each one of us has different preferences and it becomes a hassle signing in and out. Will be nice to see it switching preferences on-the-fly. Here's to next-gen.
Some videos: 1) Giantbomb impressions: https://www.youtube.com/watch?v=KXwud8fSNhs
2) Xbox UI walkthrough: https://www.youtube.com/watch?v=xhe6jV-APwM