LF betrayed him... he whispered "I told you that you shouldn't have trusted me" or something along those lines in Ned's ear... if it was a double double cross setup, why would he say such a line that only Ned could hear?

Lady Stark will not get Tyrion again. I assert this simply on the basis that it would be poor story telling.

I agree with the rest I think... the visual of Danny eating the heart seemed like foreshadowing of some sort, and it kinda fits with your prediction.

I made the same prediction about the uncle in the 2p2 thread, don't remember getting much reaction to it though.