The watery puzzle will be revealed at PAX next week.
http://www.nintendoworldreport.com/news/23929
Nintendo's official website has been updated with a game page for Fluidity, a "water action" title for WiiWare.
The description says the game combines a realistic water physics engine with puzzle game play. Liquid water, ice, and clouds will be used for solving puzzles within chapters of an illustrated magical book, Aquaticus. Further in the game, power-ups and enemies appear, adding complexity to the game mechanics. No screenshots, pricing, or a release date have been made available so far.
The game will debut next week during PAX at Nintendo's booth.