When will there be new specialization's!?

So here is the whole back story (a bit lengthy) I have been screwed over by gamestop many times but this one just practically killed me. I had Borderlands 2 and Halo 4 legendary edition completely paid off some time ago and while at the midnight release of Borderlands 2 they said i had never paid it off and i had around only 10$ of it paid for so they offered to take the money off my Halo 4 pre-order and put it towards Borderlands 2. But in the process it downgraded my Halo to a standard copy and he said i would have to come back another time to actually put money towards it and make it a legendary edition again even though i had a good 20$ on me that i could have put towards it. But being the whole person I am I didn’t want to get into an argument. So i come back the next day and by then all of the legendary editions had already sold out I knew they would be but I wanted to try anyway. But despite being screwed out of 40$ because of those damn gamestop power up cards i received my copy of Halo 4 and have been blissfully playing it and having the time of my life (other than those occasional you have received to much xp for today) but this happiness has stopped lately because i have reached SR70 and for some time now I can play games but receive no xp for them because i cannot enlist in a new specialization and it has just taken out all of the fun. So all I am asking is please release them don’t make me go back to call of duty