Kalypso Media and Haemimont (Tropico 3) announced The First Templar late last night - an action adventure with RPG elements. The game is in development for PC and Xbox 360 and will feature drop in/drop out co-operative play.
Here is a brief description of the story from the press release:
"The First Templar follows the story of two main characters - a French Templar, and his companion, a noble lady who has been proclaimed a heretic. Taking control over these two unlikely allies, the player must uncover the mysteries behind the Templar Order, play a role in a grand conspiracy, and discover the secret of the Holy Grail. The heroes face powerful opponents at every turn, in the face of the Saracen, King Philip IV of France and the Inquisition."
The First Templar is set for release early next year.