Some very quick thoughts on this:
The White Out game typically helps the PSU defense, and hurts the opponent's offense. I don't think it will be as much of a factor this year, simply because Michigan's offense isn't very prolific.
Gattis is very familiar with the PSU offense. It should help UM to stop the PSU offense.
PSU's offense has not been great against good defenses.
Should be a defensive game that will hinge on turnovers.