Despite a http://movieweb.com/star-trek-2-not-part-of-a-trilogy/Report just a couple of weeks ago from screenwriters Roberto Orci and Alex Kurtzman that stated they had 'broken' the story for Star Trek 2, director J.J. Abrams has come forward to say that no script has been written yet.
"We don't have a script yet. It is all still being worked out. It is too early to talk about what it might be. It hasn't happened yet."
Zoe Saldana was also there, and she had this to say about the upcoming sequel:
"I think Star Trek 2 is coming first. I will do that one first, and then I will do (Avatar 2)."