Fantasy Flight Games previously announced Kings of the Isles, a new expansion for A Game of Thrones: The Card Game. This expansion features House Greyjoy; however, it does include cards for the other factions. Fantasy Flight has released additional details on some of the other cards included.
Each faction will get two new non-loyal cards. In their recent blog post, Fantasy Flight provides an overview of some Lannister and Targaryen cards. Gunthor Son of Gurn is a Clansman ally coming to House Lannister, and Cohollo, a Dothraki card Bloodrider, will be able to join House Targaryen. Some additional event cards are also mentioned in the overview.