These are the words spoken by the character in the promo video;
I was king of the world, man, I thought I knew it all, and look at me now. My name is Rex Matheson, former CIA. Now representing the Torchwood Institute, because the Miracle came along. Look what it did to me, so listen to me, listen to me!
I discovered the secret behind Miracle Day, I discovered what they’re really doing, to the whole world. Don’t trust anyone, they’re all a part of it. Don’t trust anyone!
Source [Doctor Who News]