Per the various sites today; that's in order, btw. He plans on taking officials to all three. The general feeling given by Steve L. at 247 is that Michigan really likes him and would take him if he wanted to commit now (obviously he doesn't). It sounds like Stanford will be tough to beat, but U-M being ahead of Northwestern (where his brother plays) is newsworthy in itself, IMO. Obviously Michigan wouldn't take him at the risk of having Hand or McDowell get shut out...but Dickerson's timeline should make that moot.
The nutty Michigan coverage isn't so much about Harbaugh as it is a signal to the Big Ten that Fox wants to party.