A video showing new features coming in Windows 8.1, such as better multitasking, better customization for the start screen (animated backgrounds, using the desktop background and more tile sizes) and improved search. Mostly focuses on the start screen, but does contain a glimpse of the desktop and the start button.
The ability of use the desktop background on the start screen should make the transition between the two less jarring.
(via Ars Technica)
In case you missed the Xbox One announcement, here’s a two minute summary. Seems the Xbox One is all about TV, sports and Call of Duty.