Ok I'm quite sure about this one. If u don't want to be a bit spoiled in episode 5 then stop reading. It's still a theory though but very likely to happen. I'll explain why below: 1. Remember when drogon went missing in season 4? I'm quite sure now that it was laying eggs some where in a hot volcanic structure. And remember when it burned sheep and farms? It was to feed her little dragons in which i guess they are not very little now. 2. The ring in this season is edited to 1 mother dragon and her babies. 3. Euron in the trailer. Look at his eyes, he definitely saw something unpleasant. I doubt it's some Armour on the last dragon. But instead he saw more than 1 dragon.