Return of the Runelords is an adventure path for Pathfinder, and Paizo's just released a new Player's Guide for it. It gives you new options for your characters specifically designed to use in the adventure. Want a character that fits in perfectly with the themes and has some special character traits? This is perfect for you.
From the post:
The Return of the Runelords Player's Guide is here! Within, you'll find all the information you'll need to craft your character for this Adventure Path, including several unique campaign traits that will help tailor your character to the themes found in the campaign and... just maybe... set up some surprises for you along the way. In addition, the Player's Guide helps you choose which of your prior PCs, if any, who took part in Rise of the Runelords or Shattered Star might have roles to play in the background of the Return of the Runelords Adventure Path.