So the three dragons are Dany, Jon, Tyrion.
Does Jon's parentage get revealed this season? I think so. And Tyrion's next.
Also the time travel paradox is weird. But w/e.
I guess they don't want to complicate things for viewers, so Coldhands is gone. Can't have a non-evil Wight/Monster. That's also why the show makes all of its villains of the "lol I kick puppies for fun" variety. Can't actually have any sympathetic villain. Too confusing to have gray morality.