About 5 years ago, there was a rumor that iHeart would take KEGL country, though it obviously never happened. Seems like it might be a possibility for 102.1. The one thing that makes me think it won't be country, however, is that all Christmas hurts country almost as much as it does AC. Launching a country format now might not be a good idea since the audience is a little smaller this time of year.
I could also see an AC format to shore up its wall of women, though urban would be possible, too. Another dark horse format that comes to mind is classic hits. KLUV is usually one of CBS's best performers, and they knew it would go all Christmas. Launching a classic hits format while the competition is away might be smart.