I hope JJ Abrams doesn't do another Star Trek, I have no clue how they plan on him doing a Star Wars movie in two years. Took his time making the second of his Star Trek movies after delaying and delaying and waiting until the last possible minute..
Easy. The script for Episode 7 is being written right now from a George Lucas treatment. Abrams had to start from stratch with STiD so it's a different situation.