Please read the pinned post on creating new biomes and dimensions. Remember that individual items, mobs, and structures should still go in their own categories - this is not a category for entire updates.
Biomes and Dimensions
Vote for an existing idea or New post
6votes
Unnamed Dimension (with Blazes)
needs info
9votes
12votes
Corruption/ badlands/ dark lands
needs info
37votes
Wastland biome
needs info
144votes
Large biomes /Amplified Worlds
needs info
32votes
Update Magma
needs info