https://www.halowaypoint.com/en-us/news/campaign-evolvedIn case it has not been said yet, i wonder the most about the hex columns seen in the actual gameplay, but not present when above trailer was produced.
It almost looks like they would have started working on the actual game only after that, but totally from scratch.
From the earliest planning where we focused on broad feedback around art style and story to actual hands-on playtesting and focus feedback with confidential groups of community representatives over the past two years, Halo Infinite is being created in partnership with the community.
Could be a hint of sorts as to their development schedule. Maybe.