In a blog post on Friday (SIAP), ESPN's Adam Rittenberg mentions four potential Michigan opponents for the stadium opening in 2010. All four are BCS-conference schools with an open date for Sept 4, 2010: Virginia, Duke, Pitt and Oregon State.
UVA would be cool - a la 1995 Pigskin Classic at Mich. HOWEVA, Virginia is already playing USC that year. Duke already plays 'Bama. Pitt has Notre Dame and Miami, plus is probably a respectable enough program to demand a return game or a 2-for-1. Oregon St has Louisville and Boise State. I dunno. I think this list is wishful thinking.
Future schedules: http://www.nationalchamps.net/NCAA/future_schedules/index.htm