If PAL sales are any indication, Call of Duty 4 will top the PS3 charts in November. For Sony, this is not necessarily a bad thing. They need a breakout 3rd party hit in the states. Of course, it only furthers the stereotype/trend that people who spend $400+ on consoles prmarily play FPS, racers, and sports games. With Resistance, Madden, Motorstorm, and COD4 being the most popular games, it's hard to argue.
I really hope Assassin's Creed, Mass Effect, and Uncharted do well this holiday so HD action-adventure games and RPGs don't suffer in the West.