Not going to get a Halo story until like 2027 at the earliest now. Think they've abandoned completely whatever ideas previous leadership had (I.E. Expansions) and so the Campaign team needs to be downsized. Back to traditional Halo releases, or maybe the Multiplayer remains but the Campaigns release entirely separate from the Multiplayer, years down the lines after they're rethought things.
Maybe the Campaign specifically goes Unreal Engine, who TF knows.