*SPOILERS*
If you watch the last few minutes, each of them recites a line from "Along the Watchtower", by Bob Dylan/Jimmi Hendrix, which is the song that starts to play at the end. Why would they be singing lines from an earth tune if they were cylons? I was thinking that perhaps the ship is picking up signals from earth due to it's proximity, and these guys are somehow hearing it. I just wouldn't be surprised if we find out they're not the Final 5, however it would be a hell of a coup if they are.