You can find more information about it at any of the following sites:
http://www.xbox.com/en-US/live/nxe/
http://kotaku.com/5025143/the-new-xbox-experience-just-the-facts-and-maybe-some-conjecture
http://kotaku.com/5055905/new-xbox-experience-site-launches
http://www.youtube.com/watch?v=GQMAz1qIWvs
http://www.youtube.com/watch?v=97aBwgfMoic
http://gizmodo.com/5070189/new-xbox-experience-nxe-review-its-pure-improvement