Another Halo: Master Chief Collection update is coming this week which include UI upgrade and other tweaks. It was mention on the Halo website, and this update is for Xbox One game.
They outline these words;
Our next content update, which includes updates to UI and a variety of other areas, remains on track for delivery later this week. Additionally, final tests are underway for the Halo 4 and Team Hardcore playlists, and we are aiming to make these available within the next few days. Team Hardcore will launch with Halo 2 Classic variants only, and Halo 3 maps and game types will be integrated in a future update. Other fan favorite playlists are also in the works, including Team Snipers, Team Doubles, an objective-only playlist, and more.
Also team is working on even more updates that will include improvements to matchmaking, parties, and other community items. Further details about these updates will be shared later.