from a UND fan who seems to be in the know on eGriz...
http://www.egriz.com/grizboard/viewtopic.php?f=1&t=43812
"What's interesting is that Wanless states that the WAC may likely go to 12 teams over time, and have a championship game. That means 4 or 5 more WAC slots may be available over the next decade. With La Tech almost certainly leaving, and the MWC possibly losing more than Utah (like BYU and Colorado St to the Big 12 in several years), it is possible the MWC may be stealing even more WAC teams (Fresno and Nevada). As such, it's is not unreasable to believe that there may be several phases of WAC expansion: one or two teams every three to four years.
Montana and Montana State may be brought in as a pair later, once Montana State's stadium is ready and Montana has added their requisite athletic programs.
First additions: Sac and Portland
Second: Montana, Montana St
Third: Cal Poly, UC Davis"