It shouldn't come as that much of a surprise, as Cumberbatch has been said to be a host of characters including Gary Mitchell, but the early reports are stating that Benedict Cumberbatch is Khan.
Benicio Del Toro was actually said to be in talks to play Khan at one time, but for whatever reason that didn't happen.
Then when Benedict Cumberbatch came on board, the use of Khan was questioned as there is an obvious ethnic difference between the two, as the original was also portrayed by Ricardo Montalban.
So it seems we know know the identity and that as J.J. Abrams Star Trek is set in an alternate universe he took the character in a different direction.
Star Trek Into Darkness has a May 17th, 2013 release date in 3D, is directed by J.J. Abrams and stars Chris Pine as Capt. James T. Kirk, Zachary Quinto as Spock, Karl Urban as Leonard "Bones" McCoy, Zoe Saldana as Nyota Uhura, Simon Pegg as Scotty, Anton Yelchin as Pavel Chekov, John Cho as Hikaru Sulu and Benedict Cumberbatch as an unnamed villain.
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