"That one will cost $2.99. The following week, on May 22, a Ghostbusters pack will arrive. That’s right – you’ll be able to fight as a Ghosbuster or as the Stay Puft Marshmallow Man, and can equip the proton pack or the Ecto 1 weapon. This pack will also be priced at $2.99."Via http://www.slashgear.com/sonys-reality-fighters-dlc-announced-08227271/
"Sony has announced free DLC that's coming to Reality Fighters today, in addition to announcing two more DLC packs coming this month - one of which is themed after the popular film franchise, Ghostbusters. Available today for free is the Weapons Pack, which features fifteen new weapons, including a smoke bomb, a jetpack, a cannon,..."
Via http://www.manmademag.com/news/6770b/
Also: http://protoncharging.com/2012/05/08/sony-adds-ghostbusters-to-vita/