Cave biomes

In the current version, we only have 3 cave biomes, lush, dripstone and the deep dark. They're amazing, but I propose something more! Karst landscapes, Lava tubes (and volcanic biomes above ground to go with it), Littoral caves, Talus caves, Ice caves and Eolian caves. They obviously wont have names like that but I think its a unique idea. The versatility of the underground excites me, so I needed to submit the idea. 

Unrelated to caves, some updates that would be good for Minecraft. An update on the sky, an update on the end, another water update adding more structures, underwater biomes and mobs (not sharks I presume) and weather patterns. Sometimes my brain is full of ideas and sometimes I have to share them!