Review guides that arrive with a pre-release game aren't terribly uncommon. There's no guarantee who will end up with the packet at most places, and there's an attempt on the part of the publisher to inoculate itself from worst-case scenarios by including a picture of the game controller with every function mapped to it. They want to make sure the reviewer picks up the right thing, and doesn't attempt to play their game with a stapler or a snowglobe.
