The people behind Max are essentially the same as behind Ruth2 v4 and Roth2 v2.
I think the whole project started in 2023 when Ada Radius was fed up with trying to nip and tuck on Ruth2 v4 and Roth2 v2 to no avail. She had told me earlier at a Kitely birthday party that the only way to fix Roth2 would be to remake the body from scratch. It didn't help that Ada uses Blender, but she had to work with meshes which Shin Ingen had originally made in Zbrush.
The latter is also the reason why no member of the greater Ruth2 and Roth2 families has a decent devkit: Shin has never made devkits, Ada had to do that, and one does not simply make devkits for Zbrush bodies in Blender.
So it must have been in 2023 when the point was reached at which Ada decided it'd actually be easier to start over from scratch with brand-new bodies, including devkits, this time in Blender right away. That's how the Max project was launched.
From what I've heard, the idea behind Max is to be able to derive both female bodies (branded "Maxine") and male bodies (branded "Maxwell") from the same sources. This would make bodies between the stereotypical female body and the stereotypical male body possible. Or simply things like the same separate feet for the male body that are typical for the Ruth2 family so that male avatars can wear pumps.
As for the rigging, I don't know if they'll be close to anything known. I guess I can hope that Maxwell's rigging won't be as out-of-whack as Roth2 v2's.
Serie Sumei has taken over the scripting part again. The built-in technology and the HUDs will probably be largely the same as for Ruth2 v4 and Roth2 v2.
Early versions of the bodies could be witnessed in the wild at OSCC23 when Ai Austin, Ada Radius and Serie Sumei showed up wearing them.
Unfortunately, the development has kind of stalled due to health reasons on Ada's side, not to mention all the other projects she's involved in (three words: Arcadia Asylum Grid), but she wants to get back to it this year.
Here are the sources:
https://github.com/ruthandroth/max