William Shatner in Star Trek 3 > The rumor part 2 or whatever part is… update
He’ll Share The Screen With Chris Pine - source
"… not only will Shatner be in the movie, his scene will have him meeting Chris Pine. Also in that scene: Zachary Quinto and Leonard Nimoy. But if my sources are steering me correct this won’t be original timeline Spock - it’ll be future alt-timeline Kirk and Spock. Basically the scene will have Kirk and Spock interacting with their future selves."
Roberto Orci said (apparently about Trek3), the other day on twitter:
"1.No Earth 2.No Time Travel/Rifts 3.No Coincidences 4. Green Chicks and I’m there.”
……… but who knows?! :D