You think your world is safe.
It is an illusion, A comforting lie told to protect you.
Enjoy these final moments of peace.
For I have returned to have my vengeance.
So, shall we begin?"
Teaser shows a lot of devastation and a familiar starship underwater there's no clue on Cumberbatch's mysterious character whether he's Mitchell or Khan. Trailer reveals a city, field of red plants, a lava world, ruins and BC's Character at the captain's chair.
The antagonist seems like someone familiar to Kirk and crew who has returned for vengeance on those who betrayed him, possibly his mission or incident was covered up and abandoned?