If you were looking forward to booting directly to the desktop in Windows 8, you're going to be sorry, because Microsoft won't be allowing this. This means that users will be totally forced to look at that "Windows 8-style UI", aka Metro, before you can hit that usual desktop screen you're used to.
We don't know if this will effect all users, but right now it looks like it is a possibility. If the move is concrete, we can see just how serious Microsoft are at pushing their new Windows 8-style UI, or Metro, and how its going to effect Microsoft going forward. The Windows 8 Start Screen isn't just a feature that can be ignored, but will be a component of every single system that sports the OS. Maybe it sounds annoying now, but when we're used to it, we could have tiles for temperatures, e-mail, and the like, and we'll totally get over it.
But, Microsoft have also been talking about this type of move since BUILD, with it looking like it's going to be a staple feature of the OS now. The more I think about it, the more it doesn't directly effect me, as I don't fully turn off my PC all that often anyway.