Rumor after rumor suggests that Khan will be the villain of the next Star Trek movie.
DO. NOT. WANT.
Star Trek II is still the strongest of the original series of movies. There’s zero reason to revisit it. More to the point, the entire advantage of this new "alternate timeline" is so that we can see new stories with these new actors playing the original cast. That’s new stories. What’s the point of doing this if you’re just going to retell the same stories we’ve already seen, just with a few different twists?