I expect the newest OS, to be released for the Hoilday Season, by a merger of Apple, MS, and Google. It will be called Zeke 13. It will come only in a 64 bit version, will run on everything from a phone to a server, will cost $1.99 (USD), will be updated daily as new things are built, will include a complete office suite, and a program to pick winning lotto numbers.
Original image in full resolution (1366x768): http:i.imagebanana.com/img/4eh08jt6/windows_blue_8_1.png Unfortunately I'm not allowed to post links or images directly (required post count must be 20) so you have to manually copy the link into the address bar of your browser.
Keep in mind that the x64 screenshot comes from Paul Thurrott (check the PC name and workgroup he used, because Mary-Jo Foley beat him to the punch with the story), and he's not exactly someone who would leak an ISO.