Square Enix may have accidentally (or perhaps intentionally) let slip recently that a new Mana game is in the works. This information was revealed through a soundtrack CD they recently released in Japan called X’mas Collections II Music From Square Enix. Track # 9 is listed as being from a “Future Project.” Here’s the image showing the track listing:
According to CVG, the text is loosely translated to read: “Habitat Soul Shi Dancing Mind / X’mas Edit” and underneath that it says the track is “from Seiken Densetsu (Future Project).” Seiken Densetsu of course is the Japanese name for the Mana series.