Bungie said in their weekly update that the Crucible maps from The Dark Below will "become the domain of all" and be added to the rotation for regular Crucible playlists.
I have to wonder; does this mean they will grant access for these maps to EVERYONE, rather than just those who purchased the DLC? Or will it be like it was in Halo, where you only get to play the maps if you happen to be matched with others who have them?
I bought the Season Pass, and I have to say, if they were to unlock The Dark Below's Crucible maps for everyone... I'd be cool with that. So long as I get to play the maps more often, sure; give them to all manner of penniless and thrifty bastards alike.
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At HoW drop, all the maps from "The Dark Below" will be added to the crucible rotation no matter if you have the expansion or not.