To me it's not so much that they try to combine both a tablet and desktop version.
They have made that part better than in windows 8. The main problem to me it's simply the lag of new stuff. There are almost nothing here to replace win8 so far.
Sure it has a new start menu (not one that i fancy very much) but for any cool new things there are things that i would like they didn't change or add.
I can't see why they would skip Windows 9. There are nothing that makes you think this version of windows are 2 "generations" ahead of windows 8.
Terry Myerson (Leader of the Windows and Xbox operating system groups at Microsoft) said:
We have done Windows 7, we have done Windows 8. Now would it be the time for Windows 9. but we know based on the product that's coming, and just how different our approach will be overall. It wound't be right to call it Windows 9.
This statement is total bulls**t
We all know why they did it. It was because they wanted to separate them as much as possible for the unpopular windows 8.