Pablo Vazquez has made a 30 minutes stream on the Blender youtube channel explaining the overhauled version of Geometry Nodes upcoming with Blender's 3.0 release. This stream had a special guest: Dalai Felinto, development coordinator at the Blender Foundation, and one of the members of the Geometry Nodes team.
In the stream, Dalai goes in great detail on the current state of the Geometry Nodes "Fields" re-implementation, and explains key design concepts behind the new system and what lies ahead for it.