Games Of Thrones Season 7: 13 Major Questions From The Trailer
11. Does Casterly Rock Fall?
This season promises lots of action, lots of war and lots of new owners for some of Westeros' key strategic positions. We know that Dany will take her throne at Dragonstone, and from there, she's going to start staking her claim for the entire Seven Kingdoms (and hopefully, she won't just sit there stagnating, like she did in the past few seasons).
Interestingly, the trailer seems to suggest that she scores victories pretty quickly, over-running Lannister positions (hence the sigils and colour schemes) with her Unsullied army (while engaging in open warfare with the Dothraki).
By the look of it, Casterly Rock is an early target - which makes sense, as strategically, it would cut off the potential of Lannister reinforcements by sea, and it would strike a hard blow against the Lannister's heart. But you have to suspect that Cersei wouldn't let it fall unless she had a good reason to.