Contact Pro base isn't really that different other than the mini disc. If they didn't use a moderately stiffer eva on the base though you are going to get more base flex so they'll probably feel softer side to side. And no CNCing the heelcup is meh. It saved maybe a few grams, more importantly it's 3D molded to sit flush with the highback. It should perform better and be stronger.
I don't think anyone is commenting on the highback cause its just gonna be a slightly stiffer version of the Atlas. Not really new.