First reported by DSOGaming, the Project Mojave Revitalization team is calling it quits after its first (and last) release. PMR was a continuation of the ambitious Project Mojave mod to bring areas from New Vegas into Fallout 4, with the original PM devs themselves having hung up their spurs after an early access release in 2021.
Project Mojave is not to be confused with Fallout 4: New Vegas, a project aiming to do a 1:1 remake of the 2010 Obsidian classic in Fallout 4's shinier, upgraded Creation engine.
The idea with Project Mojave was to present New Vegas during the time period of Fallout 4 and after the end of FNV—a tall order given how many different endings that game had, but PM seems predicated on an NCR victory.
Project Mojave itself saw no further updates after November 2021, and the PMR dev team led by WolfeMan2077 implemented its continuation as a separate project requiring installation of the base Project Mojave.
PMR's first and only release fleshes out a selection of four new areas focused on the outskirts of the Strip, with the most notable to my eye being «Fremont,» the time lapse version of Freeside which has become the capital of a new NCR state in the Mojave.