Looking for Terminator 4 plot details? You might have to read between the lines to get them, but producer Moritz Borman has dropped a few hints about the sequel, which begins filming April 15 in Budapest.

In an interview with Empire (excerpted in The Sun), Borman said the production is "keeping the script under very tight security" before promising a "huge twist at the end." From the article:

"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."

Arnold Schwarzenegger won't be back for Terminator Salvation: The Future Begins, of course -- being that he's busy governing the state of California and all -- but according to Borman, we might see him in future installments:

"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."

When it came to rumors of Vin Diesel starring in T4, however, Borman was more forthcoming, telling Empire that Diesel "is not somebody we're currently talking to."

Source: The Sun