Well, this a bit troubling. I've never had sleep problems before (SP2 w/4300u). Today after installing all the KB's, mine doesn't want to go to sleep on its own anymore. It does if I select it from the Power menu though.
macmee reported a little while ago that he talked to Microsoft Support tonight and was told that the firmware update will come out tomorrow so hopefully it will fix whatever is going on with yours too.
I rolled everything back and timed sleep is still screwed. That's really odd because supposedly 1/14's releases weren't hardware related, so I'm not sure how whatever they broke was not undone.