"He really was a ####."
23 seconds in the preview...
Also, at 16 seconds...
Spoiler!
The Valyrian steel dagger that was used to almost kill Bran back in season 1.
Who had it last? Cat took it with her to King's Landing. Did she give it to Littlefinger?
In one of the promotional photos from before the season...
Dany very quickly lost all her Southern allies. She may have no choice but to look North.
A few little lines teasing Jon's true heritage. "I'm not a Stark" -- dragon swoops over. Then, Dany makes a point to mention that she named two of the dragons after her brothers. Now, we just need Rhaegal to bond with his namesake's son.