Here is a tasty bit of info from the March '06 Cycleworld Magazine
"Aprilia CEO Leo Mercanti has confirmed that his company will return to World Superbike in 2007 with an ALL NEW MODEL. ““based on previous racing experience””. Could this mean conversion of the three-cylinder MotoGP engine into a production unit? Mercanti says NO.
The ““highly sophisticated”” bike will be powered by a 90-degree 1000cc V-Four currently in development. A new generation of 90-degree V-Twins is also under consideration, with displacements ranging from 850 to 1200cc to replace the current 60-degree V-Twin
Further news indicates chances are good that the 77-degree V-Twin that powers the SXV and RXV might give life to an ultra lightweight sportbike
The Ampelio Macchi-conceived engine could also serve as the starting point for the aforementioned 1000cc V-Four.