Can't wait for Daenerys to get the rude awaking that Jon Snow is actually the heir apparent to the Iron Throne and not her.
The reason being is Rhaegar was the heir to King Aerys II throne. His brothers and sisters are not heirs if he has male children. He did. Two of them! Aegon and Jon Snow. Aegon was killed by order of Tywin Lannister and Jon Snow was taken by Ned Stark. Jon Snow was the son of Lyanna Stark and Rhaegar Targaryen.
It's believed that a bastiage son cannot be King, but the Targaryen's where known to harbor multiple wives and it's believed that Rhaegar wed Lyanna Stark and he loved her more than Elia Martell (his first wife) Therefore Jon Snow is not only NOT a bastige, but the actual heir apparent, not Daenerys Targaryen by birthright!
As for the 3rd dragon rider, rumor says it's Tyrion, but heh. That's a bit tough to accept, though it was referenced in season 2 episode 10 that the three dragon riders (dream sequence in the House of the Undying) that he dragons have three heads. The three locations shown were the Wall (Jon), Khal Drogo's tent (Daenerys), and the throne room. (Tyrion) Tywin said on a few occasions that Tyrion was not a true Lannister, but he carried the name and that HAD to be protected.
All three are now together and the end of the show.
Since the Targaryens were known to marry their own family. I suspect Jon Snow and Daenerys Targaryen will marry because lets face it. Daenerys won't give up the crown hah. She is becoming selfish in her old age hah.