For me, the issue is it's Kahn. He has already been done very well. ST2 is the top Trek movie for me. Nothing has come close. It was was an insult when they tried to copy it in Nemesis. This sounds far worse. And why, to get Spock's reaction. Didn't Spock get more than his fair share of grief portrayal in ST09?
I really was hoping it was someone original or maybe Gary Mitchell. There was nothing stopping them with inventing a new augment. He could have been from the Eugenics wars or another illegal Section 31 experiment. Instead they decided to do their own take on Kahn.