I don't think increasing displacement would add anything.
I'd rather see them make a factory bike with all the performance bits found in the HP kits than screw with the basic platform.
The bike has immense untapped performance potential already.
Instead of the "S" model; I'd rather see the GT model though.
Fly by wire for cruise and traction control.
Six speed trans.
Sub 30 degree rake.
Power cluster tucked in somewhere near the triple tree.
Air shocks
(I'm not a fan of the speedo on tank either, so a Roadster cluster would be nice)