Well, Penn State coach Bill O'Brien is off to the Houston Texans, putting the status of the Nittany Lions' program and recruiting class in question yet again. The two most logical choices to replace O'Brien are former Rutgers head coach Greg Schiano, who is a former PSU assistant coach and just got fired from the Tampa Bay Buccaneers, and current Miami Hurricanes head coach Al Golden, a former Nittany Lion player and assistant coach.
Roster players recruited by Michigan: DE Deion Barnes, RB Bill Belton, TE Adam Breneman, LB Ben Kline, OG Brendan Mahon, DE C.J. Olaniyan, DE Anthony Zettel, RB Zach Zwinak
2014 commits offered by Michigan: S Marcus Allen, CB Troy Vincent, Jr.
I would not expect any players to transfer to Michigan, and Michigan didn't pursue Allen or Vincent very hard in the first place, so I doubt O'Brien's departure will have any effect on Michigan in the immediate future. Olaniyan and Zettel are both from the state of Michigan, but both would likely be starting next season in Happy Valley. Obviously, the bigger question would be Penn State's recruiting going forward.
I saw O'Brien speak at a clinic in Pennsylvania a couple years ago, and while he gave a rousing speech geared toward PA coaches and taking pride in the Nittany Lions, the entire time I was thinking to myself, "This is great and all, but you're going to be out the door as soon as a bigger job opens up for you." Obviously, nobody should blame the guy for taking an NFL if that's what he wants to do, but it just shows that players should commit to programs instead of coaches. Freshman quarterback Christian Hackenberg, who had a solid season as the starter and was rated by many as the #1 quarterback in the 2013 class, is reportedly considering a transfer.