Didn't they make the 650 software available for the 12C?
There are software updates that bump up the 12C power to 616, and IRIS Computer/navigation/audio system updates. I have really been tempted to get the AMS tune, which would put me at supposedly around 716 hp, but for two reasons…. First, I am already pretty impressed with it at 616 hp. Second, there is a guy on the McLaren forums that keeps teasing us with the promise of something coming up that will blow away all of the current tune options.
As for the 720, glad I reserved judgment until I had seen more pictures. Not liking it. Not liking it much at all. But then, I really, really do like the look of the 12C, and I know there are those who are not fans. I think of all models of the recent generation of McLarens, the 12C may actually end up being looked upon with the most favor, say, 15-30 years from now.