The LA Times scored an interview with Arnold Schwarzenegger, the governor of California and mentioned he'd gladly be in Terminator: Salvation, long as he didn't have to do anything:
“I made it very clear that I don't have the time to do the movie,” he said. “I said that I would be willing to be in the movie if they get the technology together, and so they are working on that right now.” In the film, a prequel to the original, Schwarzenegger would be in a brief scene in which the main character encounters him as a “future Terminator,” according to the governor. “I think it’s cool to continue on with the franchise ... in case I want to jump over again and get into the acting after I'm through here,” he said. The governor said he did not yet know what other opportunities might present themselves after he completes his term in less than two years, but he also suggested that he might write a book about his time in office.