Latest rumor I heard was that "many" of the performance goodies from the XKR-R one-off would make it to production. Nothing specifically related to the tranny though. Somehow, I doubt that will make it here, simply because it would really need to be a factory installed item (unlike brakes, wheels, tires, etc..). darn shame, though!
------------------
'98 Jaguar XJR
'65 Corvette conv 327/350hp, 4 speed, Nassau Blue
'00 Corvette conv. 6 speed, Navy Blue Metallic