"Indeed, the new game is definitely not 'Trine XBLA' or any Trine port -- that's all in the past now," Frozenbyte's Joel Kinnunen told Joystiq. "I cannot reveal anything else about the new game yet ... I'm pretty sure it will be welcomed with open arms though! And we're really excited to work with Atlus, finally."
More information on the mystery project will be revealed at E3 next week.