Platinum Games' second project (the first to be released in Japan) is about as different from MadWorld as any game could be: it's Infinite Space, the epic sci-fi RPG for DS. Sega just announced that it'll be released in Japan on June 11. No international release dates have been announced yet, though GameStop suggests July 7. Infinite Space casts the player as a spaceship crew member who works his way up to captain, and features giant, customizable spaceships and wireless ship-to-ship battles.
Along with the announcement, Sega refreshed the Japanese website for the RPG with some animated story scenes, and released new screenshots. Hopefully as we approach release, we'll be able to see more gameplay stuff.