I was just about to post this . One must admit that those guys in lomography are creative: in long history of instant films - I believe this is the first underwater camera.
I was reading about other aprils fool joke - old game boy games that will work on iphone. On the end they will realy make it because response was huge, and they start the kickstart. Maybe the same will happen for this one as well .
Using the underwater instant camera one should always remember a thermometer, as the temperature of the water will - obviously - affect the development time needed before peeling apart the film . . .