Legendary Map Pack owners will be happy to know that within the next thirty to sixty minutes, the Matchmaking playlists will be updated to include the new Legendary maps. In particular, this means that within that time frame the DLC Slayer and Objective playlists will become Legendary Required and focus solely on the new maps.

Enjoy!

[UPDATE]

In case you weren't aware, this change is now in place and the DLC Playlists feature the Legendary maps exclusively. You can leave Luke's poor inbox alone, now.