The Ultraman X Kamen Rider X Gundam dungeon crawler, Lost Heroes, is on track for release as a Nintendo 3DS and PSP game on September 6. Famitsu confirmed three more heroes for the game: Kamen Rider Den-O, Z Gundam, and Ultraman Taro are in the game.
While the games are mostly the same, Namco Bandai mentioned a few differentiating features for the 3DS and PSP versions. Get Lost Heroes for 3DS and you an use StreetPass to collect "random cubes" which let you enter special dungeons with rare items inside. Lost Heroes supports custom soundtracks on PSP and you can even set different music for Hero Skills like character theme songs or something ridiculous like "Bo Peep Bo Peep" from T-ara.