Fantasy Flight Games has an expansion coming out for Cadwallon: City of Thieves called The King of Ashes. Take a look.
From the preview:
Fantasy Flight Games is proud to announce the upcoming release of King of Ashes, an exciting expansion for Cadwallon: City of Thieves. Your guild intrigues will grow even richer with a treasure trove of new adventures, characters, equipment, Arcana, and a new catacombs board for the guilds to explore and loot!