www.ditl.org

Here's the new plot details according to Entertainment Weekly:

The beginning of Terminator: Genisys, is set in 2029, when the Future War is raging and a group of human rebels has the evil artificial-intelligence system Skynet on the ropes. John Connor (Jason Clarke) is the leader of the resistance, and Kyle Reese (Jai Courtney) is his loyal soldier, raised in the ruins of post apocalyptic California. As in the original film, Connor sends Reese back to 1984 to save Connor’s mother, Sarah (Emilia Clarke), from a Terminator programmed to kill her so that she won’t ever give birth to John. But what Reese finds on the other side is nothing like he expected.

Sarah Connor isn’t the innocent she was when Linda Hamilton first sported feathered hair and acid-washed jeans in the role. Nor is she Hamilton’s steely zero body-fat warrior in 1991’s T2. Rather, the mother of humanity’s messiah was orphaned by a Terminator at age 9. Since then, she’s been raised by Schwarzenegger’s Terminator—an older T-800 she calls “Pops”—who is programmed to guard rather than to kill. As a result, Sarah is a highly trained antisocial recluse who’s great with a sniper rifle but not so skilled at the nuances of human emotion.

Graham Kennedy wrote:Using Schwarzenegger is a mistake, IMO. He's looking really old lately, he'll just look ridiculous in the part unless they plan to CGI his face/body for the whole movie to plastic-youth.

McAvoy wrote:I wished this was just a straight reboot.