http://www.ign.com/articles/2014/12/...something-else
"On set, a Skydance exec filled us in on some of the details. "It's not a traditional remake, nor it is a continuation or a sequel, nor is it exactly a reboot," he said. "In a sense, it's a reimagining -- and it certainly follows the same kind of logic as J.J. Abrams' [Star Trek], which is that the beauty of any world where you have time travel is that you can introduce pivotal, different events that then fracture off on a whole new timeline and let you explore how things would have happened if one major thing had gone differently.
"The movie will take place in more than just 1984," he continued. "I don't think any one of [the time periods] clearly dominates the entire movie... There is critical action in the future, and there is critical action in the past."
Later, Taylor confirmed to us that the first two Terminator movies were the primary influence of Genisys, with the latter two taking a backseat. (This is also pretty evident from the trailer.) "For me, one of the main elements of the first two movies was that it was always about the world we all know, that we can identify with," the director said. "We're trying to bridge the things that have existed in the mythology before and be true to it, while launching something new.""