The least likely of those options is Vegas followed closely by Texas. They're both too high in the P5 pecking order for BYU to end up there.

I don't know that Boca Raton is super likely, given that we just played there 2 years ago, but Frisco seems like a REALLY natural fit. If I had to bet on a specific bowl at this point, I think it would be that one as the most likely. Vegas or Texas would be the best case, but seems really unlikely. Gasparilla, Fenway or First Responder are the other somewhat decent options. Everything listed above that is pretty depressing.