I love the concept so long as it's not overdone, which is why I'm hesitant to say I'd be for it at DC. In anime, typically, their powers and abilities are fleshed out in such a way that they inform and are informed by their characters and the story; so the super form generally denote an important character moment. in western comics that generally isn't the case, so the few times when they do power up transformations they tend to feel hollow and superficial, which is why they are rare and usually temporary. So, considering the questionable creative decisions DC makes as times, I can definitely see them overdoing it by making it part of an some kind of event where every other hero (biggest names who don't need it first) arbitrarily attain a "super form" and then, if the idea fails because of their poor execution, they all get taken away anyway to be pretended like they never happened. Superman, and pretty much any kryptonian, doesn't need a new super form, nor do people like Batman or Green Lantern (GL's tend to do power up's/transformations already and they work fine as is). Wonder Woman it could work because of the whole Gods angle and her being a demigod lends itself to the idea well. ideally super forms, if they were to do it in a way I'd wanna see, should be given to the smaller heroes as a way of showcasing their growth potential and help give them a brand push. if they did it that way I'd be 100% on board.