From the ESPN Rumor mill:
There was a rumor that Boise State, Fresno State and Nevada were headed to the Mountain West Conference, which would then push a handful of I-AA teams to the WAC.
ESPN The Magazine's Bruce Feldman addressed this rumor today: "A source I spoke with said this is really just a rumor. Keep in mind that the MWC was formed because the presidents at that time did not want divisional play; they wanted all eight (now nine) teams to play on an annual basis. Jumping up to 12 teams would mean divisional play again. Complicating things even further would be the economics issue with supposed expansion as it would relate to the Mountain West TV contract. It isn't going to change with the addition of more teams, which means the money would be split 12 ways instead of nine."
So guess it ain't happening.