I might be wrong but in BO2 I think they had the popular game modes in the DLC section but they were all Core. I play 99% HC and found that great in the Ghosts DLC section but I hate that they rotate the game modes. I don't like KC or S&D so I have to keep backing out of lobbies till I find TDM.
If Xbox hasn't put them in rotation till now, a month seems to be the answer. I appreciate the input folks.