The 360 shouldn't drop too much, after all we have the same Arcade but cheaper Premium prices. The PS3 should be up by 50% or so but would be so much bigger with the Gran Turismo in December. FFXIII is releasing late in December so it won't contribute much to the world wide number.
Currently playing on PS3: God of War III
Currently playing on Xbox360: Final Fantasy XIII
Currently playing on NDS: Chrono Trigger