A DLC given as preorder bonus for Risen 2 Dark Waters scheduled for an April release was announced a couple od days back.

Here's the official word :

"Story DLC “Treasure Isle” exclusive!

Experience an exciting new story in the pursuit of Captain Steelbeard’s treasure in the pre-order bonus for pirate RPG by developer Piranha Bytes. The DLC with the fitting name “Treasure Isle” offers exclusive additional content for the intrepid adventurer. The player will embark on an extra story questline to uncover Captain Steelbeard's legendary treasure – a quest that will continue a plot element from the first Risen game and finally bring it to an exciting conclusion.

This quest will take the hero and Patty, Steelbeard’s daughter, to an unknown island that offers new environments to explore with many puzzles to solve, treasures to loot and mysteries to unravel. The player will discover a legendary item (only available in this DLC) - offering his character a permanent stat boost.

This exclusive pre-order bonus DLC with a value of EUR 9,99 / 800 Microsoft Points, will be made available in selected territories at participating retailers."

As an interesting sidenote there's also official word that Risen 2 will have Quick Time Events