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
11votes
40votes
Wastland biome
needs info
156votes
Large biomes /Amplified Worlds
needs info
32votes
Update Magma
needs info