The latest issue of Famitsu has shown a potentially epic (or potentially poor) idea from some of the main Japanese developers called Cross Edge. The game, to be released on the PS3, is an RPG collaboration from Capcom, Nippon Ichi, Namco Bandai, Gust and Idea Factory. The game will feature characters from games such as Disgaea and Darkstalkers. Currently, it's known that the battles will be turn-based and the plot is something about rescuing souls.
The game is scheduled for a release on the PS3 in Japan in September. A US release is not likely and a European release has a near zero chance of happening. PS3 games are import friendly though so you might want to take the plunge!