The other characters who've been cast, HBO hasn't confirm this but like 7-8 different sites have so it must be accurate:
Tormund Gianstbane, self-styled Tall-talker, Horn-blower and Breaker of Ice, Husband to Bears, the Mead-king of Ruddy Hall, Speaker to Gods and Father of Hosts.
Anguy the Archer
Selyse Baratheon
Qyburn
Edmure Tully
So we will see Riverrun!