I'm likely not a customer because of the weight issue.
The 550 is already lardy, though mine is prolly one of the lightest GTs around due to lack of options, it has PP1 and nothing else and is around 3400 lbs with gutted interior and light racing seats. But it still is heavier than I would like and that's my current focus, reducing weight.
The published weight for the 650 is 3900 lbs. That's a non starter for me.
Secondarily, I'm not a fan of the styling, it's seems like it's just gimmicks without much purpose.
They'll probably sell very well, just not likely to me.