If you go over to the Road Rules website, you'll see a Pit Preview for the season finale. In it, Drew Bell tells the Roadies that there has been a "major rules violation" in the past couple of weeks.
What's the rules violation? No one seems to know. It could possibly be that the Roadies have spoiled the outcomes of the Pit/missions almost every week since the show started. However, it seems to be more of a ploy to scare up some ratings and prevent the Roadies from revealing tomorrow night's outcome.
So far, there has been no confirmation as to what went down in the Pit, but we'll see once tomorrow rolls around to see which Roadies are here to stay. Also, expect a final Pit Stop as the final mission tomorrow, as a couple of Pit Crewers went out to Los Angeles to do some filming this weekend.