Yeah, exactly, this interview was during the writers' strike and they weren't sure they'd be able to film any more episodes. So it looks like we find out who is the final Cylon in our next episode....
That could be, but I think it's also possible that AD was referring at the time to the Kara-finds-her-own-dead-body thing. He's been quoted more recently as saying the Final is someone no one has guessed, and really - if it was Kara, I don't know how that could be even remotely true. And I don't see them sticking the reveal in the same episode where Kara finds her own body.
Had the show not come back, Kara as the Final Cylon might have been the answer we were left with, but I don't think that's the, um, final revelation.