Alright, so we know that Jon Snow is a targaryen, In the spoiler for Episode 2 we see the female Grey Joy at the Castle that the Targarygens built before they invaded westeros, I anticipate that within the season we see Jon snow and Dany work together, hopefully that Circi lanaster dies. Also there were several comments about Targaryens being incestual and flipping a coin about their mental state.
There's a lot to still happen and I'll probably be wrong on a couple of things. Someone @ me in a couple weeks to remind me of this.