And here's a 15-seconds teaser trailer by HBO Adria. www.youtube.com/watch?v=Ih3WsEKmID0
Tyrion in chains and Sansa at the Eyrie would be the obvious ones (in the latter case, while set photos and other pictures of Sophie Turner already suggested this, it looks like there's not going to be any "Alayne Stone" hair on the show).
There's no way for anyone who hasn't read the books to figure out she's in the Eyrie from that shot. Heck, people who have
read the books aren't sure she is in the Eyrie in that shot - there's been a discussion about it on the Forum of Ice and Fire, and some people think she's still in King's Landing in that shot. The background in that shot looks very strange and unfinished, as if they hadn't done the post-production on it; some have even speculated it's fake to cover up the actual location.
And how do we know she's not having darker hair in the Eyrie? Have there been any set photos of Sophie at the Eyrie? I've only seen the ones from Dubrovnik/KL.