If you haven't received it yet, then you might not be getting one it looks like. If you had to update your email like me, but did it after Nov 20th, then you are out of luck also. I would suggest going to Waypoint and posting on the forums and hoping you get a response. Wish there was more in terms of support for 343, but right now they are extremely overwhelmed with issues, mainly stemming from their handling of spec codes in the first place.
or this.