http://wccftech.com/four-x360-halo-games-coming-xb1/

Since Microsoft announced that Xbox 360 Halo games would come to Xbox One via backward compatibility, fans have been asking about them over and over again. Fortunately, 343 Industries said that all the four Halo titles will be available very soon.

According to the team, the back-compatibility department is making sure that the Halo games are working properly. We must remember that there are already four Halo games that can be played on Xbox One: Halo: CE Anniversary, Halo 3, Halo 3: ODST and Halo 4.