MGM has announced that over the next few years, they will release half a dozen huge tentpole films in the $200 million budget range, one which will be likely be Terminator 4.
Arnold Schwarzenegger wasn't expected to return in anything more than a cameo.
The original plan was to introduce a totally new Terminator.
"We did have to think about a new franchise character.
He couldn't carry the movies anymore. So that caused us to have, I think, a pretty novel approach about what the new terminator would be like, screenwriter John Brancato told Latino Review in 2004.
"Again, they made me actually sign things that I would not leak. As much as I would like to brag about the script, I can't really tell you."