James Cameron and Gale Anne Hurd each get a writer credit on the film's IMDb page, but I believe it's for writing the original characters, not for their participation in writing this new script.
Mike, found this:
"Terminator: Genesis (since renamed Terminator: Genisys) will be directed by Alan Taylor, best known for directing Thor: The Dark World and selected episodes of Game of Thrones. He will be working on a script that has been written by Pathfinder and Shutter Island screenwriter Laeta Kalogridis and Drive Angry and Dracula 2000 trilogy writer Patrick Lussier.
That's not entirely true, is it? It will have something to do with the original, but is also said to be the start of a new trilogy.
The IMDb page notes "The plot is undisclosed at this time." But the same link I posted above offers this:
Very little has actually been released about the movie's plot. What is known is this...
The movie will be both a sequel and reboot of the Terminator franchise and the first installment in a new trilogy, with events in Terminator: Genesis crossing over events from the first two installments (1984's The Terminator and 1991's Terminator 2: Judgment Day), with an alleged alternate timeline being created after a (as of yet unknown) key event from one of the aforementioned movies, a la Back to the Future Part II and 2009's Star Trek.
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