This is just a regular home and home series, nothing with the B1G-Pac12 deal. That deal will start in 2017, and the teams/matchups will rotate, so its not like we are matched up with oregon and northwestern is matched up with stanford, its just a coincidence. They are taking WVU's place because WVU opted out after its move to the big 12.
"The University of Illinois is also in turmoil. The university sports an Interim Chancellor, an Interim Athletic Director, and an Interim Football Coach; the game will be played at Soldier Field, making this an Illini Interim Home Game."