Rumor is that UM got three commitments this morning.
I think you can pencil KY OT Cory Zirbel in, as he's been leaning heavily to Michigan for a long time, despite a recent Miami push. And KY DT James McKinney used to be a UM commit and has been leaning to UM too. So he's probably another.
As for the forth? TX OT Mark Ortmann, OH CB Brandon Harrison, IL OG David Moosman, and PA DT Marques Slocum are all in visiting. The only one looking to make an immediate decision is Harrison, who decomitted from ND when Willingham got fired and is down to Iowa and UM with Iowa, who recieved a visit last week, as the leader.
Personally I hope it's either Harrison or Slocum. Harrison was the MVP of the OH Nike Camp this year and ran a 4.25(!). Slocum is a near five star who can play on the interior line on either side of the ball, and you can never have too many of those guys.
The guess here is Harrison, Zirbel, and McKinney.