i havent got my code for the specializations yet does anyone know how i can get it
Don’t think it’s coming mate 
Did you play before the 20th of November? If so, you should have gotten it by now, but if not, then XBL must have stuffed up Only hope then is a kind individual with a spare code.
Since you have not received one you will have to wait until they are released. The closest time frame in which they will be released is 2013.
i played on release date and never got an email!!!
i got halo the day it came out and got no code
Specialization codes have been distributed. For more information on the distribution process, check this post