By the end of this year, the Xbox One's backward compatibility program will finally include all of the Halo games released on the Xbox 360. Microsoft announced this news as part of its "Halo Summer Celebration" news update on Thursday, and while it's good news for owners of those games, a similar slew of classic-Halo fans have been left scratching their heads.

The series' remaining back-compat holdouts (Halo 3, Halo 3: ODST, Halo 4, and Halo CE: Anniversary) will land "later this year" on Xbox One. In an intriguing twist, anybody who owns those games either digitally or on disc will be able to play either online or via LAN against players on Xbox 360 consoles. (The backwards-compatible collection contains very few games that take advantage of this inherent "XB1 and X360 in same LAN party" feature.)

However, the news update includes zero updates about the Halo: Master Chief Collection, a 2014 game whose matchmaking bugs and woes have proven to be legendary. As of press time, users continue to flood the series' official forums with bug reports and complaints about lengthy matchmaking times.

The listed games in today's news update all happen to be part of H:MCC, but only their original Xbox 360 code is getting updates, as opposed to the recompiled H:MCC versions. As the update reads, those games' fans may be better off digging out their old discs and slapping them into an Xbox One than relying on the anthology versions—especially since Microsoft also announced on Thursday that all map packs for those 360 games will be made entirely free.

Perhaps Microsoft could win back some goodwill by giving all H:MCC owners free digital licenses for its 360 equivalents, but that would still leave Halo 2: Anniversary, a H:MCC exclusive, in the dust. We have asked Microsoft about any news or updates regarding the anthology, and we will update this report if we get a response.

The series' handlers at 343 Industries did confirm on Thursday that Halo 5: Guardians will receive an Xbox One X update "later this year" with "true 4K support." (The popular game was curiously left out of Microsoft's E3 announcement about the new console last month.) More details on that update will come closer to launch, 343 says. We have also asked Microsoft whether H:MCC might see a similar 4K patch—which, quite frankly, would be awesome for that collection's local-multiplayer modes. (Halo 5 shipped without local-multiplayer options , which 343 eventually admitted was a bad idea .)

Update, 2:47pm ET: 343 Industries responded to our H:MCC questions about possible 4K patches and matchmaking bug-fix patches by sending this statement:

We’ve made a host of significant improvements to Halo: The Master Chief Collection since the initial launch in 2014, and while the majority of players enjoy the game regularly, any issues or interruption in play is something we continue to keep a close eye on. That said, we do not have any additional updates planned in the near term, at this moment.

This article has been updated to clarify LAN connectivity for backwards-compatible games on Xbox One.