With Windows 7 on the blink of release (its actually RTM...), Microsoft actually has 5 new OS up their sleeves:
1. Windows 8 (Windows 7 Successor)
2. Windows Midori (Written entirely in managed code)
3. Windows Singularity (Basically the same as Windows Midori)
4. Windows Azure (Cloud Computing OS)
5. Barrelfish (Multicore OS)
Windows 8 being the biggest hype. With a new filesystem and totally gone with Windows Explorer, is Windows 8 what we had been waiting for? Btw, there are already lots of fake alpha on torrent site. ALL fake. I doubt any Windows 8 alpha will be out soon since its schedule for 2011. Yes, thats a bit too fast to phase out Windows 7. But well, there are companies still using Windows XP...