The alleged leak lists several pieces of information on the next Call of Duty game, including the game's rough count of 35 weapons available in multiplayer, the return of new -like mode, vehicles playing a large role in the game, and many other details.
Here's the full list of "leaked info":
-- Vehicles will be in MW2
-- M16 will return, using stopping power will only be OHK at head, neck, and torso (abdomen, limbs, and hands/feet will not)
-- Ak47 and M4 will return, unknown if there are any changes