343 originally announced that a matchmaking patch for Halo: The Master Chief Collection was set to release on Wednesday, but have now pushed back the update until later this week.
The title has been severely troubled by matchmaking issues since launch--searching for a game online can be an indefinite fruitless endeavor, and at best offers a very long wait time. There have been small updates released but the upcoming patch is the largest yet, aimed mainly at fixing these problems. The delay will allow 343 to add additional fixes and complete the verification process, according to an official Halo Waypoint post.
"This content update includes a variety of fixes across the title, including Matchmaking performance issues, general UI and game stability improvements, as well as fixes for game-game specific issues in Halo: CE, Halo 2, and Halo 2: Anniversary, and more. The full patch notes will be posted later this week, in advance of the content update release."
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It certainly sounds like a comprehensive update, though frustrated fans will still be disappointed that it's not arriving sooner. The individual game fixes are likely a side issue compared to the matchmaking woes for most players--a large portion of the game (with the most replay value) simply isn't working correctly right now. At the least, this patch will hopefully transform matchmaking when it does arrive.