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Ron says that the four who were revealed in the season finale are indeed Cylons, but fundamentally different from the ones we know.
R: Are these four all full Cylons?
RM: Yes, but they are different fundamentally.
R: Why did Roslin have a mental connection to Sharon and Six and not the other Cylons on board?
RM: They are fundamentally different Cylons.
So I'm sticking to my prediction. (There's more at the link above.)