Windows 8 will have major changes. That is true.
But it has drawbacks too...
The Retarded new start menu interface: sure, it makes access on a tablet much easier, but Microsoft fails to realize that NOT EVERYONE WILL HAVE A FRIGGING TABLET! On a traditional screen, it just makes it harder.
This will be the last x86 version of Windows. Make of that what you will; I see it as major compatibility problems for the version of Windows after 8 (As in, somewhat new computers that are 32-bit that would otherwise be able to run Windows IX being turned down because it requires 64-bit power).
They re-arranged everything AGAIN! Just after everyone got used to Windows 7's screwed up new arrangement too... Keeping computer users on their toes is how they roll, I guess...
... Looks like now would be the prime time to download Linux or to purchase a Mac (or to create a Hackintosh).
The outlook for Windows-based PC's looks bleak.