In the first video Traveller’s Tales explains the console versions of the game. What is most interesting is that the first part of the game takes place between the events of “The Lion, the Witch and the Wardrobe” and “Prince Caspian.” The C.S. Lewis Estate gave them permission to fill in the gaps of what might have happened to cause the overthrow of Cair Paravel in the 1300 year gap between the films.
Here’s a video from GameSpot with the team leader talking about the Prince Caspian DS game.