With secondary TV rights under bids, I really hope that either CBS or NBC are part of the Big 10 package.   To my eye, these two broadcaster's football telecasts simply look better on television.   Both CBS and NBC broadcast in 1080i (instead of 720p like Fox and ESPN/ABC) and for the majority of the game and studio shows, this simply looks visually much better.   The 720p format is supposedly better for motion, but I don't remember the last time that made any difference to me when watching NFL games on CBS, or NFL/Notre Dame on NBC, but I DO notice how the extra lines of resolution make the broadcast more clear and crisp.  Every time I watch studio shows on Fox, I really notice the difference vs CBS or NBC.  And the bigger the TV, the bigger the difference.
Wouldn't it also be kind of funny to hear the CBS college football theme for a Big10 game after so many years of almost thinking it is the SEC theme song!