https://wccftech.com/halo-mcc-xbox-one-update-all-insiders/

The major Halo MCC Xbox One update is now available to all registered Halo: The Master Chief Collection insiders.

Earlier this month we already reported that the finish line of the first big update for Halo MCC is finally coming into view. Developer 343 Industries also announced its plans to open up the next test phase to all MCC insiders, and this next phase has now kicked off.