Interviewed on the Humans From Earth podcast, Orci addressed the issue that the existing two Star Trek reboots have, for the most part, not strayed terribly far from Terra Firma.
"In [Into Darkness] they set out finally where the original series started," he explains. "The first two films – especially the 2009 [Star Trek] – were an origin story. It was about them coming together. So they weren't the characters they were in the original series. They were growing into them and that continues on in the second movie. So in this [third] movie they are closer to the original series characters than you have ever seen. They have set off on their five-year mission. So their adventure is going to be in deep space."
To clarify, that's not a coy reference to Star Trek: Deep Space Nine, just so we're clear.
That's as far as Orci is willing to be drawn so far, and when asked about future adversaries for Kirk and co he remained cagey. But it does sound as if new villains and alien races are on the cards, rather than any more revisiting of previous glories. He jokes about the Horta, but his real position is "Let's see what's out there".
Having begun the writing process with his regular cohort Alex Kurtzman, Orci has continued it with franchise newcomers J.D. Payne and Patrick McKay. There's no firm release date for Star Trek 3 yet, but with the 50th anniversary of the original series arriving in 2016, we can probably expect it around that summer.