Sorry, Halo 5 Is Not Being Added To The Master Chief Collection - GameSpot

Microsoft says again that it has no plans to bring Halo 5 to The Master Chief Collection.
The Master Chief Collection brings together four Halo games into one collection for the Xbox One.

Halo 5: Guardians – Xbox One : Microsoft Corporation

Halo: The Master Chief Collection - The Ultimate Halo Experience Trailer - IGN

Halo: The Story So Far

What are some good custom games on Halo 5 for 4 to 6 people? - Quora

Halo: The Master Chief Collection' Rumoured to be Headed to PC - Bloody Disgusting

Halo Infinite Preview - How Halo Infinite Serves As A Spiritual Reboot - Game Informer

Halo 5 Hopes to Shock and Surprise You - Frank O'Connor

Halo: Reach' Will Have 6.2 Million Multiplayer Maps On PC/Xbox Launch - GAMINGbible

Dani

IGN - Halo Infinite's single-player campaign, like a new generation of Master Chief's MJOLNIR armor, powers up a 20-year-old series, by both returning to its roots and blazing new trails to build

Halo 5: Guardians – Xbox One : Microsoft Corporation

Halo Infinite will launch with 23 maps according to dataminer : r/XboxSeriesX

Halo 3: ODST HD Was Never Planned - GameSpot

News - September, 2021