Dragonforge, by James Maxey, is the sequel to Bitterwood, which was one of my favorite books of 2007.
With Shandrazel now dead, his son has become king and is determined to bring about the end of kings and establish a commonwealth. But not all of the dragons and humans agree with his method of peace. Hatred and vengeance runs deep. And when the villainous Blasphet escapes from prison, he contributes to the dissention and chaos in the land.