Not so fast. There were at least two instances in the 2010 season when Nebraska & Iowa were on ABC at the same time and both times, the Nebraska was shown on a digital subchannel of KCAU and Iowa on the main feed of KCAU (the subchannels aren't HD capable).
There are also ABC affiliates in Davenport, Kirksville, MO/Ottumwa, and Austin, MN/Mason City. Kirksville/Ottumwa normally goes with the Big 12 game, but in markets like Davenport, Austin/Mason City and Cedar Rapids, the only time in the past you would ever find these markets showing a 2:30pm Big 12 game is when Iowa St. is playing and the same can be said going forward as well. There just isn't the interest for Big 12 football in these markets.
The 3 main markets you need to worry about are Omaha, Sioux City, and Des Moines. With KETV out of Omaha, I expect them to be Big 10 heavy for the 2:30 game and will only show Big 12 games when Iowa St. is scheduled. If we ever come to the bridge that ISU & Nebraska are scheduled to play at the same time on ABC. Most definately KETV will go with the Nebraska telecast. Wether or not the ISU game makes it to the reverse mirror, depends on who they are playin.
I really don't know what route KCAU & WOI will go. My guess is probably a balance between the two conferences, but that depends on the matchup (say for example ABC picks up a TT/KSU game for the 2:30 game, my guess is that all ABC affiliates in Iowa will go with whatever the Big 10 game is, regardless of matchup).
The reverse mirror will be handy, but there's a limit as to the number of times that the Big 12 2:30 game can be used in the reverse mirror and for the 2010 season, that limit was maxed out in early November.