I know... i know... Windows 7 is the latest version Microsoft has released and personally i am very happy with this very stable version in most parts! So there are a lot rumours about the next Windows version (probally called Windows

around and even on the net... And sure, i personally think about possible changes and improves for the next Windows.
The most rumours are, that the next Windows will use the new EFI for fast booting instead the old and outdated BIOS architecture! I am not really sure what to thing about EFI, when it comes to security, drivers directly stored inside EFI and so on... Sure, faster booting time and less memory usage would be nice! (Even when talking today about Gigs of HDDs i am very supried about the required GB space, a blank Windows7 needs and even how much memory even a simple app requires (like MS Calc == ~6-7 MB of required mem when take a look to the taskman)
Until MS releases any official papers/statements or the final Windows 8, all things are ofcourse rumours!
Believing some sources, MS will show Tablets and has plans to show a new operating system... (probaly an early version of Windows 8?) Sounds interesting! Rumours are saying that its possible that MS will show a first look into Windows 8 - even the biggest MS partners like Intel got a first windows8 milestone release!?
I am still looking forward to get hopefully very soon some official statements/infos from MS for the next Windows when it may come in 2012/2013... Its a long time and a lot things could changed in that time... even the market with Chrome, Android and Co