The Fort Wayne Journal-Gazette and CBS affiliate WANE-TV are both reporting that FWA is landing Allegiant Air. A press conference is scheduled for tomorrow at 10:30 AM EST. More information is available here.
Personally, I can't wait... leisure passengers have been forced to go to IND for low fares for eons, and G4 will do great here. As for G4's choice of cities: my guess is that SFB is probably a given, PIE is highly likely, and LAS is a long-shot.