Well, more trumped up, unprecedented nonsense for effect this week. Cally was having problems since the nebula?? Who knew?? Answer: They made it up for effect, for mystery, etc, etc. Killing off Cally is stupid. No reason to, other than to do it. Obviously, they decided to make Tory a sadistic nutball so they had to do something to show it, but kill Cally?? Whatever.
And now we are all spinning our wheels thinking, "What can it mean? What can it all mean??!!" The answer is nothing.
Do we all remember how they brought Ellen Tigh into the show and were hyping her up as a Cylon? And what came of that? Nothing. She was no Cylon. She was just some thoroughly screwed up person. She died like any other human being, except at the hands of her husband of course who just happens to be a Cylon.