Scorpiuscat from our very own forums has written a nice preview of Windows Vista including a lot of info of under-the-hood workings and features:

All in all, these features make me excited for Vista with the one caveat and this is as long as these features work as advertised. I don?t know what all the downsides to Vista will be, there is not a lot of info on that floating around on that; besides all the different flavors of Vista that will be available and there is no news that I can find if all flavors of Vista will contain all of these features.

3DGPU.com