When you don't hear about a game for months, you start to presume the worst. Like, that it's been cancelled. We haven't heard about This is Vegas for months, so has it been cancelled? Surprisingly, no, it has not.
Despite being caught up in the implosion of Midway (the game's former developer/publisher) and its own development troubles (it's been coming along quietly for years now), new publishers Warner Bros. have told G4 "This is Vegas has not been cancelled. The game is currently in production".