In a recent interview with Empire magazine, producer Moritz Borman spilled some cryptic details about the upcoming Terminator 4 film, which begins filming on April 15 in Budapest.  Borman did however say that the production is “keeping the script under very tight security” before promising fans a “huge twist at the end.”

Arnold Schwarzenegger will not be back for T4, which is actually called “Terminator Salvation: The Future Begins.”  But, he may possibly show up in future installments after he’s done governing the state of California:

“It’s convenient that he hasn’t been built at this point of the story, as Arnold has more important things to do right now, but that doesn’t mean he might not re-appear later in the trilogy…he knows the material and is very supportive of what we’re doing. There might even be hints of his character in this one.”

Speaking further about the film, Borman said:

“I can tell you this much — this is the story everybody has been waiting for. Namely, we’re in the future. The part of it where Arnold’s character has not yet been built but is on the drawing board.

“And in the next two episodes we’ll get to the point where time-travel is more in the foreground. It’s the war against the machines, the start of Skynet taking over the world.”

Additionally, Borma dispelled any rumors of a Vin Diesel appearance, stating that he “is not somebody we’re currently talking to.”  In other words, if they were talking to him at some point, it never panned out.