What the sources confirm

Minecraft's official overview says the sequel includes new enemies and areas and highlights a soul-corrupted Creeper. Official systems coverage also describes the Twisted Warden quest.

What is not confirmed yet

A complete mob list, behavior, spawn locations, drops and variants are not verified in the official pages captured for this pre-launch snapshot.

How to use this answer

Use the Twisted Warden page for the named quest encounter, then re-check enemy names and behavior against the live game.

Visual reference

Original fan-made voxel artwork for Mob overview
Original fan-made artwork for this independent wiki. It is not an in-game screenshot or gameplay evidence.