Map packs probably wouldn't sell, but this on has new vehicles in a much more vehicle-centric game.
My guess is that Sony is seeing if they can get away with charging money for stuff like this, much like Nintendo tried getting away with releasing a Bran Training game on the Wii at almost full price.
The price will probably be low enough to encourage impulse purchases, and downloadable content is very profitable, so I imagine they'll do pretty well with this.







