I was talking to a friend tonight, and we're both hoping this is true. The thought of the NC resistance being comprised of 4 Cylons is kinda mindboggling. But it would fit if the Final 5 are philosophically opposed to the actions of the others.
I suspected Anders was going to be one after he was signed to a contract for S4. Tyrol? Due to him finding the Temple and his reluctance to destroy it. Tori? Never suspected her, but I wouldn't have been surprised. Tigh? That's the only one that doesn't fit. He fought in the war. Could the Final Five have started to infilitrate that early in the pre-series?
Interesting spoilers even if it they turn out to be false.