Thats right, everyone who has the MCC will get a patch that includes ODST. Due out sometime in Spring. It is 343's apology for -blam!-ing up royally.
Link:
http://t.joystiq.com/all/2014-12-20-343-announces-free-odst-campaign-as-apology-for-halo-mcc-woes
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Will we get it if we accidentally uninstalled it?