Blender Developer Extraordinaire Sybren Stüvel has made a blog post on the Blender Developers Blog extensively describing the new Pose Library system shipping with Blender 3.0.
— Blender Developers (@BlenderDev) May 21, 2021
The pose library is an extension of the Asset Browser, also in heavy development. The new pose library has many advantages over the old one:
- Preview images are embedded in the poses themselves.
- It's available in the 3D viewport
- Poses are always available
- Opens Doors for more sources of Pose Libraries
The videos above showcase the new Pose Library usage via the N view panel and Asset Browser respectively. Check out the awesomely detailed blog post for more details on the overhauled system, including how pose creation works within it: