https://www.gamespot.com/articles/e3-2018-halo-infinite-revealed-as-xbox-ones-new-ga/1100-6459571/

Microsoft's E3 2018 presentation included a look at the next installment in the Halo saga from 343 Industries. Titled Halo Infinite, the new game in the series is built on the Slipstream engine. Phil Spencer appeared on stage to say it would be Master Chief's "greatest adventure."

Although a trailer was shown, it was largely just a showcase a number of environments, from a desert to a forested area. At the very end of the trailer a number of soldiers are shown throwing down a flare, the camera then pulls out to show Master Chief's helmet in the corner of the screen, confirmed his return. It's notable that the game, at least at this point, will not have a number in the title, as the other core entries in the series do.