Release Date : ? 2009, Japan–USA
Description from Mariowiki.com :
Mario and Luigi across the Mushroom Kingdom to solve the mystery of and find the cure for a deadly disease plaguing the land, seeming to make the Toads round and big. This would explain the giant Toads in the hospital. At one point, Bowser also tries to kidnap Peach, but he fails. In a second attempt, he uses something called a «Lucky Mushroom?» which gives him the ability to inhale everything. He uses this ability to eat Peach, along with Mario, Toadbert, and a yellow Bob-omb-like character.
It is also speculated that Fawful may be an antagonist in this game, since some enemies bear a resemblance to him. The Flying Saucers featured in the trailer have green domes instead of the purple of Shroob Saucers, and are speculated to belong to Fawful. Looking closely at these UFO-like devices will reveal what appears to be a pair of bluish spectacles, similar to the ones Fawful wears. Also, at one point in the trailer, Bowser is seen chasing a blurry green and red figure riding a flying device. However, it also speculated that the green and red figure is Prince Peasley.
Official Site : ?