A bunch of new biomes will be coming to Minecraft in the 1.18 Caves & Cliffs update part 2. The dates are unknown, but Mojang will be releasing the update later this year.
The world generation height is also being increased in the update. Once the update is out, caves can generate downwards till Y level -59, and mountains can rarely be as tall as 260 blocks.
Some of the new features are already available to test in beta versions of Bedrock Edition and experimental snapshots of Java Edition. Normal snapshots will be released next month if the developers do not face any major problems.
List of biomes coming in the Minecraft 1.18 Caves & Cliffs update

Caves
Caves of Minecraft will be receiving three new biomes: lush caves, dripstone caves, and the deep dark.
Lush caves
Edited by Shaheen Banu
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