It's called The Return of the Ice Kings, and Gondry is writing it now:
The Return of the Ice Kings, as Gondry describes, is "a story about kids who invent a water that makes you hear music when you drink it." What the heck? Gondry explains where it came from: "I'm into science - in fact, I read more about science and astronomy than about movies. Science is re-questioning itself all the time, and it's still at a stage where anything is possible." And obviously it shows, but I think Gondry can pull it off. However, it goes further than that, check this out: "At one point, they see the end of time in the movie, so, we'll have to shoot it somewhere that looks like the end of time."
New films from Michel Gondry, Spike Jonze and Mike Leigh in 2008! Woo-hoo! Let's hope that this year turns out better than last years sludgefeast.