The release dates for The Winds of Winter and A Dream of Spring are unknown. As a huge fan of ASoI&F, and hardcore annoying book purist, I get it. Jon’s parentage wasn’t a secret that could be kept much longer, with only two shortened seasons remaining. HBO can’t wait for GRRM to finish A Song of Ice & Fire.
HBO hasn’t confirmed all theories about Jon Snow’s parentage. They have Lyanna Stark listed as “abducted” by Rhaegar Targaryen. The events leading to Jon’s conception are almost as important as who Jon’s father is; because an abduction and rape mean Jon is still a bastard. However, if Rhaegar and Lyanna did marry, well, that makes Jon the rightful King of Westeros, doesn’t it? Could Rhaegar have married both Elia Martell and Lyanna Stark? Would that have even been possible? Will Sam find the answer in the Citadel library?