In the photos and video posted at embedded link, a scene in which in which Jon, Davos, Missandei and a few Dothraki welcome the just arrived Theon and some ironborn in the shores of Dragonstone.
Jon basically goes at him with full rage and anger because of Theon's past sins.
This confirms yet another part of the leak which said:
Euron's fleet destroys Yara's and he takes her prisoner. Theon abandons her, jumps overboard and is rescued by some Iron Born.The Iron Born lose any remaining respect they had left for Theon. Jon and Theon meet, Jon telling Theon that if it wasn't for what he did for Sansa, he'd be dead.