According to Crave's Collider website, J.J. Abrams says if he had it to do over again, he would not have played coy about Khan's identity in Star Trek Into Darkness.
“The truth is I think it probably would have been smarter just to say upfront ‘This is who it is.’ It was only trying to preserve the fun of it, and it might have given more time to acclimate and accept that’s what the thing was.”
Check out the full interview above from MTV.