http://www.siliconera.com/2012/08/09/the-little-battlers-w-is-the-first-game-to-support-vita-vs-psp-multiplayer/
Level-5 says The Little Battlers W will be the first game that supports cross hardware play between PSP and PlayStation Vita. The Little Battlers W supports up to six players with three Little Battlers on each side. So, even if you decide to getThe Little Battlers W for Vita and your friend has the PSP version you can still play the game together.
Actually, the PSP player might have an advantage. If you have save data from The Little Battlers you’ll unlock Achilles. Save data from The Little Battlers Boost unlocks Epsilon in The Little Battlers W.
And you can get a password to unlock Hero of the Universe Perseus S if you pick up a first print copy of The Little Battlers W. Early copies also include two mascot figurines.
The Little Battlers W comes out on September 27 for 4,980 yen ($63) on either handheld.
