On both PS4 and Vita. Sweeeet. If you've been following Grand Kingdom (and you damn well should have been!), this is hypeworthy news that may keep me from booting up the localization of Odin Sphere (which I already beat, in Japanese earlier in the year - not a brag, just a game I've already played).
The demo will drop June 7th on both platforms, and progress from said demo will carry over to the full release! Groovy!