The currently Japan-only PSP RPG, Tales of the World: Radiant Mythology 2, is growing far beyond just the Tales universe. The all-star lineup of Namco Bandai stars expands in new downloadable content, which allows players to get costumes from Soulcalibur and Legend of Valkyrie. According to Siliconera, most of these costumes have been free.
We're pretty certain that Namco Bandai will bring this game over to the US, DLC intact. It seems as though PSP owners will need to get ready for a new era of DLC and microtransactions.