As questions continue to be asked about the future of certain exclusive Xbox franchises, the next Halo game will reportedly be available "on all platforms."
A recent job listing at Halo Infinite developer 343 (via Twisted Voxel), for a lead game systems designer is looking for a candidate to help "define, prototype, validate, iterate, and evolve future Halo games. In that same listing, however, it's also noted that 343 wants someone to "focus the systems design team on achieving a high-quality, cohesive experience for all players, on all platforms."
