Microsoft bucked the trend and decided to count in a new modern way and skip Windows 9 altogether. I'm not exactly sure why they wouldn't go from Windows 7, Windows 8 and then to Windows 9, but Windows 10 is now announced officially. I think this is mostly to appease the Germans. Either way, there is a lot of details that are now public today and if you want to see what it looks like in action - there are some official screenshots at the link below.
Microsoft is launching Windows 10 as the new face of both Windows and eventually Windows Phone. At one point during Microsoft’s Tuesday press event, Terry Myerson, the executive vice president in charge of Microsoft’s OS group, called the new OS “our most open, collaborative OS project ever.” Collaborative, indeed. Microsoft is looking for user feedback, and what I demo'd on Tuesday may not be the same OS that customers receive next year.