Perhaps he’ll be confirmed Plagueis in said DisnEU material, but I just don’t see it happening in the movies, even if only for the reason that no casual viewer would know or care who Plagueis is.
It’s possible but it would be kind of insulting to omit such a crucial detail in the films for the sake of not confusing people who have a less than rudimentary knowledge of the franchise. And yes, I am speaking as an entitled Star Wars aficionado.