343 released an update to the Halo 5: Guardians beta for those that installed it in the early access period, asking them to download a rather sizable 7 GBs to the currently dormant build.
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The total file size post-update is actually smaller than it was beforehand, so some data has obviously been replaced. Users on Beyond Entertainment's forums first posted the news of an update, but nobody is sure what exactly it entails at this time.
All of this is in preparation for the beta's semi-public launch on December 29, which will open the game to anyone who owns Halo: The Master Chief Collection. This will be a significantly larger number of people than those who played the early access beta, which was limited to a few publications, some pro players, and members of the Xbox Preview program.
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The updates could be anything from matchmaking fixes (though this didn't seem to be an issue unlike The Master Chief Collection) to graphical upgrades or gameplay balances. Most hardcore players would probably prefer it to be the last option, as there was much discussion over what needs to be improved. Features such as sprint and climbing will continue to be contentious, but 343 seems set on their inclusion. Smaller tweaks such as movement speed and damage amounts will likely be addressed, and the developers have made it known that they want feedback--stay tuned for word on what the update includes.