Well, if you hink about it, Treyarch doesn't decide the price for the maps for the game, the publisher
Activision, will most likely be deciding the price. Since it's the same publisher I'm gonna guess it's gonna be the same price, 800 MSP or US $10. Although as said before Makin Day has been confirmed to be free with the next title update. We'll know soon enough though, March is on it's way!