Microsoft will skip version 9, and will instead go to straight into version 10 sometime in the next year or so. This is very interesting, and one wonders: what COULD have been with Windows 9?! Not really, it's just a number after all. But this is interesting, given the dramatic shifts away from PCs over to tablets or "phablets" [assorted phone devices + tablets] or more importantly, hybrid style laptops that can be adjusted to become a hand held tablet. Microsoft will need to be extremely aggressive in order to maintain any sizable chunk of business sales in any future workstation, hybrid device, and smart phone markets, given the enormous success of Google and Apple lately.
This woman does a nice simplistic overview of Microsoft's announcement in this YouTube video.