Fox has announced that the season finale of freshman series Dollhouse will air on May 8th, concluding with an episode titled "Omega", the 12th Dollhouse episode produced.
But Dollhouse has 13 produced episodes, you say!
And you are correct. The 13th episode of Dollhouse, "Epitaph One", will be included on the show's DVD release (dropping July 28th), as will the unaired pilot.
As for if this implies that the show's chances of renewal are in trouble...some say yes and some say no. It's possible this is a bad omen, but it's also possible that the network merely decided that the 12th episode is a more natural season's conclusion.
Update: It's being reported that the unaired pilot is being considered one of the 13 episodes, which would make "Epitaph One" technically the 14th episode and not officially part of Season 1. So, don't interpret this as a cancellation just yet! More details