This was leaked unintentionally as Ubi put up an interactive map on their site that shows off the Northern Island and allows you to click on spots for info on animals, locations, weapons, ect. In the source code, there was information not yet used that they were probably planning on updating and making visible once the game was released.
So I wonder if in Multiplayer, the Bow is carried in place of Frags and C4s? That seems fair I guess. This is a pretty cool assortment of weapons! I'm happy with it at least. Just wish there were actual throwing knives, maybe that's what one of the two unknowns are?