Game Of Thrones: Season 7 - 8 Clues From "Stormborn" Trailer
3. Bloody, Sandy Murder?
You have to have pretty sharp eyes to spot her, but Tyene Sand makes a brief cameo in the trailer, plunging a dagger into someone in the dark, her face twisted in hared. Presumably, the person on the sharp end is an ally of the Lannisters, since the Sands are shown on Dragonstone elsewhere in the trailer.
This is slightly speculative, but the background looks like a dungeon, and Tyene looks like she's been banged up (hence the wilder hair). Could this be an escape from Greyjoy custody, rather than simply part of the battle? What if she and Ellaria actually intend to be captured (their approach to fighting always seems to suit infiltration in shadows), and this captivity is precisely where they wanted to be?
Or maybe this is simply Tyene's last stand?
Incidentally, imagine being promised a gift and it being the Sand Snakes. How annoyed would you be?