In the game of Hollywood Dominos, you never know what is going to happen. Since J.J. Abrams stepped away from the Star Trek franchise (though still producing) to direct Star Wars: The Force Awakens, the directing job went to Robert Orci until recently. Then Orci was out and a new director was needed.
Meanwhile, Justin Lin of the Fast & Furious franchise, who is also directing a few episodes of True Detective season 2, was set up to direct the second Jeremy Renner Bourne Legacy film, except that film got bumped when Matt Damon and Paul Greengrass returned to the original Bourne Identity franchise, freeing Lin up to now accept the job of helming Star Trek 3.
Robert Orci also remains a producer on the Star Trek film.
The initial Star Trek reboot with Chris Pine and Zachary Quinto grossed $380 million worldwide in 2009, and Star Trek Into Darkness, grossed more than $460 million worldwide in 2013.