I reached level 70 and haven't not received my access code for the other specializations. I heard if you played halo 4 online by Nov. 20th you would get a e-mail with a code for the other ones. Whether or not this is true i have no clue but was wondering if there is going to be e-mails sent out soon because it's less exciting when there is nothing to work towards and you get no more XP.