'Halo 4's Castle Map Pack: What goes into making new DLC?
Digital Spy
343 Industries explained that the point of new map packs is to sustain the community, ensuring that Halo 4 fans have something fresh to play in the months following release. However, they're also used as an opportunity to listen to what the fanbase wants.
Halo 4 Castle Map Pack DLC videos offer insider info on new mapsDLCentral

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