I mean, (assuming you've seen it already) from what I remember the entire first act is set up for the audience to believe that the T800 is the bad guy again, hunting down Sarah Conner just like before, with a huge reveal when he ends up saving her and her son instead, and the trailer gives that away in the first 30 seconds.
And then the full trailer spoiled the main twist
In what way?
I mean, (assuming you've seen it already) from what I remember the entire first act is set up for the audience to believe that the T800 is the bad guy again, hunting down Sarah Conner just like before, with a huge reveal when he ends up saving her and her son instead, and the trailer gives that away in the first 30 seconds.