Alpeeeert, oops wrong character. KHAAAAN.

and yes I realize that there is no story or script for Star Trek XII, but it still irks me that people are even thinking about including Khan in the film.

If they do use Khan, I totally approve of that casting choice.

i am ok with Khan, just introduce him in another way. Have him be an ally for the 2nd film and set him up to be a villain in the 3rd. just spit balling ideas. like the casting idea though

What rumor? From whom? This seems to me to be just another fan casting call. Last I heard there was neither a script or a director attached to the sequel, which makes speculation on possible villains and who may be playing them premature to say the least. I can't accept this as anything more then wild speculation and someone's wishful thinking.

While I'm sure that Kahn will eventually make an appearance, I doubt it'll be in the sequel if for no other reason then because he was the villain of the second film in the original franchise. My money would be on the Klingons or something similar. Something to establish the new canon and how the reality-warping events of the first film effects the different cultures and politics.

Personally, I think Montalban portrayed Kahn very well, and I would be wary of seeing someone else try to do better. It may be interested to see another fan favorite show up from the old series though, like Harry Mudd.