To clear a few things up first I don’t mean monthly updates only or do this instead of the epic planned upcoming features. As it was used in Minecraft dev terms by content creep I mean when all of a sudden a lot of little bits of content are added suddenly to fill out the game.
This was recently done really successfully with @Tom asking for craftable items for the weaver and carpenter. The reason I suggest this as a monthly activity is that while the huge features such as mining and better combat and all that will be great but it was the recent addition of things to build that I believe has made it much more enjoyable to play. Also the extra content makes the game feel more fleshed out.
My thoughts if one of the team took a couple of days a month to add a new type of crop and a range of things to make it would flesh the game out in a way that means it gets better to play fast even without the huge epic features such as water mining n that. it could be as simple as making there be both raspberry and blue/blackberry bushes but that makes the world more impressive or as an example different types of fencing so you can pick from a variety rather that it always being the same.
To further this I loved the way we were asked what should be added maybe a thread could again collect ideas with a poll being created to pick the best few that make it into the content creep day list
Anyway thats my two cents whats yours?
TL:DR - Each month devs take a day or two to add random furniture or small bits to flesh out the game with players inputs