I'm not sure if this information has been posted before since it's quite old, but I'll post it anyway. Sorry if the pictures aren't great in quality. This is a much better rendering than the previous CCX/Enzo mash-up mess posted. Very exciting details!
From Road & Track July 2006:
Information was conceived through Ferrari, industry sources and the artist who designed the car on these pages. Following its usual pattern of a new supercar every seven years, Ferrari will unveil the Nuovo Enzo in 2009.
Enzo's 5.0 liter V-12 will be punched out to somewhere around 6.5 liters with about 800bhp, versus the Enzo's 650. Combined with the extra power and less weight (the Nuovo Enzo will shed more than 200lb, US version expected to come in under 3000lb. through even more use of carbon fiber) the car could hit 60mph in under 3.0 seconds and the quarter mile in the mid-10s. Once again this will not be a top-speed record-breaking car, Ferrari choosing to focus on handling at all speeds. But figure on the car attaining 230mph.
Unlike the dramatic change in styling between the F50 and Enzo, the Nuovo Enzo (though the car will definitely not be called Enzo) will share the current car's general shape, but lose the jagged design that some found less than appealing. Think of it as a cleaned-up Enzo.
The front of the car shows the most significant changes, with an actual Formula 1-type font wing - right down to the hangers. That wing is adjustable in length, height and angle. The two wings above adjust their angle according to speed. The low side flaps that sit directly ahead of the front tires are also adjustable, as are the carbon-fiber rocker panels that fine-tune downforce at speed. The rear of the car has a huge diffuser but does without any kind of wing. Variable aerodynamic bleed, as show in the FXX, will optimize downforce and drag, most of this lurking beneath.
One of the more beautiful aspects of the car is the flowing front fenders, much different from the Enzo's. You'll also note a lack of mirrors, replaced by a camera on the car's roof that gives rear views. The roof also incorporates an air scoop that grows out of the windshield.