Today’s a great day for Fans of the Halo franchise as Microsoft adds four Halo games on Xbox One’s backward compatibility library. Among the titles: Halo: Combat Evolved Anniversary, Halo 3, Halo 3: ODST and Halo 4.
Though these four titles are already playable on Xbox One with the release of Halo: The Master Chief Collection, fans may have to wait for the presence of the original Halo 2 in the compatibility library until Microsoft adds support for original Xbox titles on Xbox One.
[Source]: Xbox.com: Backward Compatibility.