This is a rumor over at TrekMovie that was started by a presumed production assistant with IDM Comics that created a heated discussion about it. In the trailer there is a scene where two men are seen walking out of a room filled with pods (crew of the Botany Bay). One guy on the left has broad shoulders, a ponytail and wearing what is presumed to be a white Sikh coat. People are presuming it is Khan. I wouldn't mind a CGI Kahn if they got it right. After all, they got a CGI Marlon Brando right for 'Superman Returns'.