I'll be able to test my theory that the games are actually getting more unbalanced as the series goes on. By my estimates the knife-kill will have its range doubled, and ignore solid objects completely. Killstreak rewards will begin after your first kill and sniper rifles will automatically fire if an enemy is between the crosshairs. The maps will include a single 50 metre corridor with a 90 degree bend in the middle, and the campaign will be a cell-shaded, 2d sidescroller so the dev. team could focus more on the multiplayer.
Sorry, I couldn't resist it, I liked MW and MW2, but just saw several things done worse in the sequel, which I listed and expanded to their logical extremities, because I am avoiding work.