pulling out my greek mythology expertise, there are 12 olympic gods and goddesses, there are known to be 12 cylon models.
The 12 olympic gods are:
zeus(m)
poseidon(m)
hades(m)
hestia(f)
hera(f)
ares(m)
athena(f)
apollo(m)
aphrodite(f)
hermes(m)
artimis(f)
hephaestus(m)
-----------
7 male, 5 female
the Cylon Models:
One/Brother Cavil(m)
Two/ Conoy(m)
Three / D'Anna(f)
Four / Simon (m)
Five / Aaron (m)
Six / Caprica (f)
Eight / Athena/Boomer (f)
and the final 4/5 :
Anders(m), Tyrol(m),Foster(f).Tigh(m)
which gives 7 male, 4 female. I am not sure if mapping the models directly to a god works very well, however the 7:5 ratio seems likely to be kept. So who could the final one be?
The possible ones are Thrace(f), Baltar(m), and the President(f). All three have visions, which is think is a key indicator. Thrace's apparent resurrection makes her seem highly likely, but I suspect she is a red herring, too obvious. And Baltar seems like a good suspect as well, but he is male, so he does not fit. My money's on the president, it would be a shocker. Thrace would be too obvious.