Windows Blue Build Shows Improved UI and Multitasking
Assuming this is all completely legitimate, the most obvious change pertains to the Metro UI, including greater flexibility in sizing Live Tiles and customizing the Start screen, particularly as the Personalize setting (among others, including Devices and Share) is now under the Settings charm. The Name Group feature for the Start menu looks a little more polished, too.
It also appears as though you can run two apps side-by-side for better multitasking, and there’s more robust SkyDrive integration, which makes plenty of sense. A number of items under PC Settings have been added and modified, which means some better functionality, although those who have learned to navigate Windows 8 will have to re-learn some things.
All of the above seems to confirm what most are expecting, which is that Microsoft's Windows Blue will indeed be more of a facelift for Windows 8 as opposed to a major overhaul or total replacement.