It's a six-mode WiiWare game which, according to that piece, offer "the simplicity of catch ball for between one and four players."
Without stating the bleeding obvious: WHY DON'T YOU THROW A BALL AROUND WITH YOUR FRIENDS INSTEAD?
The world's gone mad. More through the link. Official site's here. It's out in December. Balls, however, are available from most commercial centres on a global level all year round.