With USC, PSU, and OSU on bye and no marquee matchups across the B1G, it's difficult to predict how the networks will select October 25 games (I would not be surprised if networks exercise their 6-day option to see the outcome of this week's matchups).
My best guess:
CBS @2:30 pm CT
ILL@Wash is a top 3 October 25 B1G matchup (I may be biased) and therefore should slot in to one of FOX, CBS, or NBC.
Due to the Pacific Time zone, it won't be Fox@Noon. With the Illini having to travel across the country after the game and no bye the following week, I think the B1G will avoid the night window (prevent Illini from getting home at 4am local time).
Other October 25 B1G games:
UCLA@Indiana - Fox@Noon ET
Rutgers@Purdue - B1G @Noon ET
NW@Nebraska - FS1@3:30 ET
Minn@Iowa - B1G@3:30 ET
Wisc@Oregon - FS1@7ET
Mich@MSU - NBC @7:30 ET