You Heard It Here First (I think)
Things are just adding up too well in my mind that Baltar is now a Cylon. Consider his uncanny tendency to sense what turn out to be other Cylons (Doral, Boomer). I added speculation on this based on past events. In particular, a nuclear blast of the type that leveled his home would cut both Six's and his body to shreds--her body was far from sufficient protection. Remember that such a blast turns everything (rocks, metal, wood) into a wall of death that bludgeons all, like a volcanic pyroclastic flow. Consider that we see Baltar relatively unscathed after this, with no explanation of his escape. This is a serious matter to consider since we must remember that the TOS Baltar actually joined the Cylons, becoming a commander, and became more than a mere traitor.