If you are in the Xbox Preview Program on Xbox One you should be receiving an invitation to the Halo 5 Beta tomorrow 12/19. The early access beta will run through 12/21 and presumably resume again for the regular beta at the end of the month. If you aren't in the Xbox Preview Program this is just one of the great reasons to be invested in it regularly. Great benefits and you can help improve your Xbox One. Check out the link for more info.