The Terminator reboot might already have its John Connor locked in, and the actor that might portray him is Jason Clarke. Clarke has been in such movies as Zero Dark Thirty and Great Gatsby, and is now apparently in talks to play Connor in this new trilogy.
Game of Thrones star Emilia Clarke has been rumored to be a frontrunner to take the Sarah Connor role, and the role for Kyle Reese has yet to see and rumored actors to be cast. The Terminator reboot is set for a July 2nd, 2015 release, and if there are anymore casting rumors I will let you know.
Source: Comingsoon.net