This should be a move to refresh a product with more relevant memory type. I don't think the GTX 1660 GDDR5 card is going to stay around for much longer.Why is there a need for a third card in the exact same tier is beyond me. Calling this one "Super" is literately the equivalent of flame decals on a car, Nvidia is pioneering ricer video cards.
One thing im a bit unsure about is the future of the GTX 1660 Ti. The new GTX 1660 Super might get a 249$ Price tag while retiring both the standard and the Ti models of the GTX 1660.