According to the reliable Game of Thrones fansite “Watchers on the Wall“, the filming in the past week was concentrated on the Greyjoys. To be more precise, it involved the Greyjoy siblings (Theon and Yara) “engaging in battle at sea,” with, in all probability, their uncle Euron Greyjoy.
According to the website, Euron is set to team up with Cersei Lannister since his nephew and niece have already reached out to Daenerys. And if spoilers/rumours are to be believed, Euron will take either Theon or Yara prisoner and he will also kill one or more of the Sand Snakes.
While the Sand Snakes aren’t well liked, ever since they killed Doran and Trystane Martell, and we don’t expect much weeping by the fandom for them. However, the other developments are quite huge with endless possibilities of speculation. For example, if the Greyjoy siblings are fighting Euron (assumption), is Daenerys with them? Did the huge army split up and resultantly the Greyjoy siblings and the Dornish Army headed for the Iron Islands while the Dothraki and the rest of Daenerys’ army headed for the King’s Landing? The possibilities are endless and as of now, we can do nothing but speculate. Happy speculating till we have more details.