I have today opened up the git repo of MPFB 2, https://github.com/makehumancommunity/mpfb2, for public access.
This is a complete rewrite of MPFB 1 with added features (rigify support, procedural eyes, rig helpers...) and much improved code structure and performance (imports are 3x faster for example). A list of changes can be found at https://github.com/makehumancommunity/m ... changes.md
While some parts of MPFB 1 has not been ported yet (see https://github.com/makehumancommunity/m ... /status.md) and the official status is pre-alpha, I have used MPFB 2 a lot myself lately, and found it to be reasonably stable.
MPFB 2 should be able to co-exist alongside MPFB 1, but it requires at least Blender 2.90.
Nightly builds of MPFB 2 can be found at: http://download.tuxfamily.org/makehuman/plugins/. Builds made when something relevant has changed can be found in the dist directory of the git repository. Most of the time the dist dir build and the nightly build will be exactly the same code.