Windows "Blue" Is Officially Called Windows 8.1 and Free
Microsoft just announced on a call with shareholders that the Windows Blue update will officially be called Windows 8.1, which will be a free update. It'll be available for both Windows 8 and Windows RT.
A preview will be available to the public after the Microsoft Build conference. Windows 8.1 is expected to fix a lot of the biggest concerns users had with the Metro interface, without completely abandoning the concept. More here.