Mary Jo Foley has an article running which almost confirms a few of the rumours:
Windows Blue named Windows 8.1.
Blue to be free.
Available through the Store and not Windows update.
Initial public preview release end of June 2013.
Release to manufacturing around August 2013.
Includes GUI...
Normally, I don't believe one of those "My friend says..." stories, but a friend of mine has claimed to own a copy of Build 7140 of W7, which was given to him three days ago (Before the leak of 7127). I somehow trust him, because of the fact that he has been giving me updates + news about...