Abrams recently chatted with Hollywscoop.com, and he explained that he has nothing to say about the upcoming sequel, because there is no script at this point in time:
"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)."
Star Trek Into Darkness was released May 17th, 2013 and stars Chris Pine, Zachary Quinto, Zoe Saldana, Karl Urban, Simon Pegg, John Cho, Benedict Cumberbatch, Anton Yelchin. The film is directed by J.J. Abrams.