There will be two versions of the 3. One will be the normal with more engine and a second 'sport' version with much more engine, wheels, etc.
EDIT: Went back a looked at an old newsletter. Engines are 260-300 HP, Models are Sport, Luxury, M Series, more LEDs used for exterior lighting, it will have the iDrive (modified of course), priced about the same due to G35, slightly larger interior. These are all guesses.