Mike Ausiello just sent out a note via Twitter that he's hearing Fox will put DH on the bench for November sweeps and will instead air back-to-back episodes Fridays in December. Hope Joss has an endgame planned for the show. :|

Kevin Reilly already said that they will definitely air all episodes, but they might be pushed out of prime timeslots, such as those in November sweeps. Joss Whedon expects the second season finale to be the series finale and has written accordingly, while leaving some small windows open on the off chance that Fox renews it for seemingly no reason like they did last time.