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343 Industries has delayed the upcoming patch designed to resolve ongoing issues with Halo: The Master Chief Collection's multiplayer mode. A new blog post explains the studio believes more time is needed to check the stability of the update before rolling it out, especially as it's one of the biggest patches yet. It's also apparently rethinking its previous comments regarding beta testing for all future content updates, as this now may not happen.
http://www.ign.com/articles/2015/02/02/halo-mcc-multiplayer-patch-delayed-beta-rethought