Imagine, you watch Into Darkness, Harrison die and the end of the film doesn´t clarify if Cumby is Khan or not. It is possible with JJ.
Also wondering how the whole Eugenics Wars thing would be presented. I imagine it might get mentioned as in TWOK when Montal-Khan intones, "On Earth...two hundred years ago...I was a prince. With power over millions!"
Don't have to say 1996... can just make some vague reference to Earth's past.