I'm copying this post here so there can be discussion on the topic.
It's almost certain to be either Arkansas or S. Carolina in the Sugar Bowl for tOSU.
Here are the most likely scenarios for the BCS Bowls, based on what can happen in the remaining games.
NOTE - OPTIONAL PICKS are bolded in the order they'll be made
If Auburn and Oregon both win:
BCS Title: Auburn-Oregon
Rose: Wisconsin-TCU (tOSU won't pass Wiscy in the BCS, and the Rose is required to take TCU if Oregon is in the Title Game)
Sugar: Arkansas (to replace Auburn) vs. tOSU (at-large selection)
Orange: VT-FSU winner vs Stanford or WVU/UConn/Pitt
Fiesta: Neb-Okla winner vs Stanford or WVU/UConn/Pitt (forced to take last AQ team, both Big East Champion and #4 Stanford have AQ spots)
If Auburn loses to S Car and Oregon wins:
BCS Title: Oregon-TCU (assuming TCU doesn't get jumped by Stanford or Wiscy)
Rose: Wisconsin-Stanford (non-AQ requirement lifted if TCU is in Title game, and the Rose would love to take Stanford)
Sugar: S Carolina-tOSU (at-large selection)
Orange: VT-FSU winner vs Auburn (at-large selection)
Fiesta: Neb-Okla winner vs WVU/UConn/Pitt (forced to take AQ team)
If Oregon loses to Oregon State and Auburn wins:
BCS Title: Auburn-TCU (assuming TCU doesn't get jumped by Stanford or Wiscy)
Rose: Wisconsin-Oregon
Sugar: Arkansas (to replace Auburn) vs tOSU (at-large selection)
Orange: VT-FSU winner vs Stanford or WVU/UConn/Pitt
Fiesta: Neb-Okla winner vs Stanford or WVU/UConn/Pitt (forced to take AQ team)
If both Auburn and Oregon lose:
BCS Title: TCU-Stanford (guessing they'll both stay ahead of Wiscy)
Rose: Wisconsin-Oregon (and the possibility of a split AP champion exists)
Sugar: S Carolina-tOSU (at-large selection)
Orange: VT-FSU winner vs Auburn (at-large selection)
Fiesta: Neb-Okla winner vs WVU/UConn/Pitt
I don't see any other scenarios which will affect these selections.