Yeah, i saw the same thing! So i started searching for it and i got so mad. So i then looked of COD's Facebook page, then i found that we wont have it till tomorrow... its so confusing why they have it saying its available to us today when they're saying on facebook it'll be tomorrow.
It's included in the DLC, you're not paying for the guns. You're paying for the Maps and the weapon is just a little bone IW throws our way since they skimped on it back in Modern Warfare 3 and said it was impossible to do.