R+L=J is finally canon and Game of Thrones writers and director reflect on this big revelation from season 6 finale:
Dan Weiss (Showrunner): The second part of the Tower of Joy is something that hopefully answers a question that lots of people have been wondering about.
Miguel Sapochnik (Director): The secret she whispers into his ear just before she dies? The best way to answer that question is to not answer it. You’re not going to know what she said.
Bryan Cogman (Writer): It seemed appropriate that Bran ends the season starting to take control of his powers and that he learned this information as he is heading south to find his family. At the same time, Jon ascends to being the true leader of the North.
Check out more in the video below.
(There is also a fan theory which tries to guess what Lyanna said. Read about it here)