Okay so I have like the 10 stinking months to see if I'm right, but I have a theory. If you haven't seen the last episode of Season three, go no further. I'm telling ya. 

So here's guesstimation. 

Chief Tyrol will be the first outed as a cylon. Confused and desperate he will seek the one cylon he trusts. He will ask Sharon/Athena to meet with him in some far off area and meander to the point. She'll think he's nuts, but will believe him finally. But of course can't tell him anything, because she has no idea about any of it. Just some legend so or something. She will be troubled by the news and soon will tell Helo. Then after that, one or both of them will turn Tyrol in as a cylon. (Ironic if she does it, predictable if he does it since he's such a wussy). 

Now, I predict they will go to either Admiral Adama or Tigh (Again the irony! Ahhh!) and the Chief being an honest man still a little shell shocked that Sharon turned him in, admits it and is promptly thrown into the brig after much soul searching and chest beating of the staff. Chief will be in there a very long time, unwilling to reveal the other cylons he knows of. (Irony abounds!) Of course Kallie will be a mess, what's frakkin' new.

The other secret cylons (two of which just happened to be the other backbones of the New Caprican resistance with Tyrol) will finally reveal themselves, of course Tigh's revelation will practically cause an implosion within the fleet becasue if he can be one, anyone can. Maybe they even help break Tyrol out for safe passage to a Basestar before they admit it.

Oh and Kara is the 5th final secret Cylon, but you probably guessed that. I think her "resurrection" triggered something and caused the music to "flip the switch".

Tell me that's not kick ass and sensible? Go on I dare you!