I have little to no doubt Rhaegar is Jon’s father. I believe the information they didn’t want to reveal now is whether or not Jon his the legitimate Targaryen heir. There is a history of polygamy in the Targaryen family. Just because Rhaegar was already married to Elia Martell doesn’t mean he didn’t lawfully wed…

I find it interesting they don’t have Tyrion on that map. I still believe Tywin was telling the truth before Tyrion killed him “You’re not my son.”