I like what the author the article has to say about Peter David in a review of David's prequal to After Earth
(And if Peter David runs true to form, his contributions will be better than the actual movie he's supporting.)
The complete story is at http://io9.com/5967572/how-did-human...-prequel-story
Trek writers Michael Jan Friedman and Robert Greenberger are also involved in the project.
There's a comic book that's out now from Dynamite Entertainment -- After Earth: Innocence
. Friedman and Greenberger cowrote it, and it takes place before the film.