True, and now formally has the status of a beta version.
A major mod for Fallout: New Vegas, released in 2010, appeared on the Nexus Mods website. The mod is called Fallout: New California and offers players a new storyline campaign with full voice acting. The mod takes place on a new game map with an area of about two-thirds of the world of the original New Vegas.
The authors call their work an unofficial prequel to New Vegas, and in one of the next versions they plan to add the ability to start playing the original game after passing the mod.
In addition, New California also has a Russian version.
The first iteration of the mod was released back in 2013 under the name Project Brazil.