Naw it won't be 4500 lbs. But 4000 sure. It's going to be a low-capacity performance oriented single motor hybrid for the front wheels only. It'll take a tenth or two off 0-60 and 1/4 mile and maybe give an extra 5 or so mpg in town. Cost ya $50k more, and be even more unicorn than the c8 already is.
Yet still, I'm intrigued