Sony has nothing besides Uncharted 3 to push sales in Americas this holidays... Uncharted 3 will be awesome but you cant compare it to Gears of War 3 or Halo Anniversary... Or even Mw3.
Gears of War 3 will push thousands of Xbox 360s, Modern Warfare 3 will push Milions...Than you have Forza MotorSport 4 wich will be HUGE in Europe essentially in U.K and Halo Anniversary wich should push some Xboxs in November...
If they Price Cut they will have a 2M November and >2.5M December for sure.