As soon as I saw that they had ideas on biomes. It dawned on me that they definitely need to make sure these biomes are diverse and have different feels and layouts to them. I wonder if there is any idea on mixed or cross biomes? Either 70/30 or a small section of one biome within another biome.
We could have a plains that has a small section in the middle with a grassland section or a small marsh within a forest. It I think depends on how large the biomes are and how much physical game world they will take up if this will be possible.
Quoting from the update:
Moreover, there can be visible differences even within the same biome. Here’s an example of a Birch Forest and an Oak Forest sub-biome within a Grassland biome:
So yes, things already work that way! You can have a grassland biome that is about 1 km2 in size, and inside of it have one or more forests, of different types. What is not possible is to have a swamp as part of a grassland (which would make it different from a swamp part of a dry plain, for instance), because a swamp is a main biome. However, we could easily design a portion of map to have a small swamp biome surrounded by grasslands. Everything is possible!