Four star RB Demetrius Hart has in fact decommitted from Michigan. The news broke some time before his team's playoff victory over Seminole Ridge. The good news is that he did not commit to Alabama straight after the game, which a few people suspected he might.
This means Michigan is still under consideration right now, and Rod Smith (UM Florida recruiter) was in fact at the game and spoke to Dee afterwards. He's obviously just not comfortable being committed to a school that has no long term coach right now, and to be honest, that's fair enough to him. He's an early enrollee, so you have to understand the situation he's in.
He'll enroll in January, but he might have to decide a while before that, meaning his announcement would probably come before Michigan's bowl game. Seen as Rich Rod's future really depends on whether he wins a bowl game or not, I think Dee will likely end up at Alabama. The timetables just aren't in our favor.