Much refined aerodynamics, significantly less weight, more power - really all the things you'd want to be better in a track car. Essentially take the 12C GT3 - toss the rule book out the window and throw all of McLaren's & CRG's knowledge and expertise at it - that's the 12C Can Am Edition.
I wasn't taking notes at Pebble and would imagine the press release spells things out a bit clearer than I have.
>8^)
ER.