I heard that it will go without Arnie, but he would like to make a cameo. The only way they can do this is if the resistance comes across how they sent the original terminator to kill Sarah Connor, pre-John. It would be cool to see them sneak into whatever production facility they have, and see all these Arnie skins being put on endo-skeletons. That way they can afford to have him in there... just keep him from talking. The most unbelieveable thing about the whole franchise was his accent.
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