Forza Horizon and thought "Man, I wish I could look at a tablet to see the map instead of having to hit the pause button like some kind of cave man," Microsoft has solution for your oddly specific wish.
Available now on Windows 8 and other platforms "soon," the Forza Horizon "SmartGlass Experience" moves Horizon's map from the game's pause menu to the screen of a Windows 8 tablet. There, the map continues to perform all of the same duties as it does in-game, allowing the player to set GPS destinations, get information on events, etc.
Now, however, instead of having to pause the game to look at the map, all the player has to do is put down the controller and pick up a second device to perform the same functions. Whether they pause the game first, or go careening into the side of a mountain, is entirely up to them.