343 Industries has no interest in making a Battle Royale mode for Halo.
343’s Jeff Easterling and James Bachici were asked on the 343 Mixer social stream whether there would be a Battle Royale mode in Halo Infinite, and Easterling replied, “I’ll tell you right now, the only BR we’re really interested in is Battle Rifle.”
Halo Infinite was announced at E3 2018 and will use the new Slipspace Engine created by the studio. 343 Industries said they heard “loud and clear” that players weren’t happy with how little time they could play as Master Chief in Halo 5, so Infinite will focus on his story, picking up after Guardians.
Source: IGN.com Halo Dev Replies to Battle Royale Query: "The Only BR We're Interested in Is the Battle Rifle"