No joke, the Nintendo DS will be getting some Call of Duty loving. It will, just like Call of Duty 4 be set in the modern world and will be an FPS.
The production values seem high, this game is one to look out for. Perhaps there will finally be another decent FPS title to play besides Metroid Prime Hunters.
Lots of great new features are coming in with Call of Duty 4, while some are relatively small changes, such as guns that shoot through walls, others like 'Create a Class' are set to completely change the way the game will be played.