-Last seen escaping the Red Wedding because he went outside to take a piss, Brynden "Blackfish" Tully (Clive Russell) aka Catelyn's uncle is returning to the show for the sixth season.
-Set reports have noted that tents have set up camp outside of what is assumed to be Riverrun which basically means we're getting the Siege of Riverrun
-This is mostly significant because it was a Jaime storyline where he was settling affairs post-war Westeros. It leads to possibly bigger things for him, but it ends in a cliffhanger because GRRM is evil Santa.
-No word on if Tobias Menzies is returning.
book readers, do you allow yourself to hope for what else this could mean?