UPDATED 18/07/2008 23:58
In an interview with Aaron Douglas prior to May this year, he had this to say…
Jamie: Are we going to have to wait till the very end to know who the final Cylon is?
Aaron: Nope. You’ll know, I don’t know if you’ll know in the first ten, but somewhere around there.
During the writers strike he said…
Aaron: I was curious quite a bit but it was certainly a shock when I found out who it is. I never would have expected that person. It is revealed in the last thing we shot so if we don’t come back, that will be the end of the show. (Source)