Level 5 have announced a release period for their time travelling multi-platform "massive world" adventure Time Travelers. Japanese buyers will be able to buy the title on both PSP and 3DS (whether the announced Vita version is a PSP title emulated or an actual port has yet to be clarified) in the Summer.
While obviously having a huge focus on time travel, the developers have said that there will be a massive world to explore. It was announced late last year that the game would be multi-platform, a much celebrated announcement from Sony fans. There has yet to be an announcement concerning a release in the West, but many people remain hopeful.
Personally, from watching the trailer, I can't help but wonder where all the Disney characters are, but perhaps that's just me. It looks very Kingdom Hearts, which isn't a bad thing (especially if the writing is a little more original in Time Travelers than in the Square-Disney mash-up).