Darktide’s competitor 4 person coop shooter titles (e.g. DRG, HD2) have handled this by going “Hey, here’s the outline of what we’re looking at, maybe some details, let us know what you think, hope it’s making you excited, all subject to change, we’ll keep you updated!'” while releasing new content at much greater rates.
Darktide for some reason has taken the approach of “Say nothing until there’s lots of public pressure to do so, then give only the vaguest details that we’re doing something, and keep everything in the dark until immediately before or literally at launch.” There’s no community feedback until after launch, no hype to generate, but instead a lot of cynicism and uncertainty.