Source - http://trekmovie.com/2012/04/30/major-star-trek-sequel-spoilers-confirmed/
2. Leonard Nimoy returns as Spock Prime and "he has already completed his work for the film."
3. Benedict Cumberbatch is playing Khan, but "sources indicate that the film is not a rehash of 'Space Seed,' the original Star Trek episode where Kirk and crew first encounter the genetic superman from the past."
I love 1 and 3 - but not so much 2. This time 'round I was very much expecting a film that stands on its own, without any ties to the original continuity, so I hope Spock Prime's involvement is minimal.
Thoughts? =)