I saw this a while ago when Watchmen came out, but I just now felt I should acknowledge it for how awesome of a trailer it is.
Before this trailer, I was iffy about the new Terminator movie. I was with Peter Griffin when he announced "I just don't get why we need another Terminator...", but my opinion has been totally changed.
I was in Watchmen with my dad, my brother, and one of my friends, and right when the trailer started I shouted "NINE INCH NAILS SONG!" because I could tell by the intro instrument, whatever it is. Now the reason I liked this trailer so much isn't simply because it's NIN, but it's because the song makes the intensity of the clips being shown really draw you in. The scene where the music quiets down, and Christian Bale unchains the android who thinks he's human was the single part that really sent shivers up my spine...