From the release:
The Wars to Come expansion for The Iron Throne board game is now available at retailers and online through our webstore!
With its two new Houses and twenty-five game-changing allies, The Wars to Come brings more players, more intrigues, and more betrayals to your battles for the Seven Kingdoms.
Based on HBO's award-winning Game of Thrones television series, The Iron Throne challenges you to outwit and outmaneuver your rivals. You send your leaders to meet each other on the field of battle, you make alliances with other Houses, and you break those alliances. In the end, there's only one thing that matters—your place atop the Iron Throne.
Now, with the addition of House Greyjoy and House Martell, The Wars to Come allows you to enjoy these contests with as many as seven players. But it's not just the size of the game that changes; you'll find that these Houses also permit more scheming, more uses for your hostages, more aggression, more trickery, and more of all the carefully constructed chaos that makes both the game and the HBO series so fantastically absorbing.