According to the official Noby Noby Boy website, the peculiar PSN title is receiving a title update today, adding amongst other things Fart Boy.

In addition to the gaseous Fart Boy, the update will also include Offline Multi Boys, a new game mode in which four players can take part together on a single system. The official site also mentions new sound effects and the ability to select music, new variations for Boy House hair styles, changes to the poses that birds make when they think and "more and more".