- Bapabooiee
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- Fabled Legendary Member
They already mentioned that you would not only be able to play the new maps via the Heroic DLC playlist, but it'll also pepper them in to some other playlists. And if, say, you have the maps, but a friend doesn't, it won't let you play the DLC maps, only the default ones.
They are not free, yet. I believe they will be free in Spring, which is the same time more new maps come out.