When we last got a peek at Windows 8.1 "Blue," most of the updates lurked under the surface: rumors of a Start button revival didn't pan out. Flash forward to Paul Thurrott's screenshots of a newer build, however, and it's a different story. The leaked code has the Start button once more occupying a spot on the desktop taskbar, with behavior reportedly like what we've seen with Stardock's Start 8 utility. More throwbacks also appear to be in store. Users can now transfer their desktop wallpaper to the Start screen, and the storied boot-to-desktop option is available -- if turned off by default. Microsoft hasn't acknowledged the existence of these (or any) Windows 8.1 features, but the rapidly approaching Build conference suggests that we'll learn more in the near future.
Source:SuperSite for Windows