The modding team is currently working on a fan-made DLC for Fallout: New Vegas, Fallout: Nuevo Mexico. This mod promises to offer a heavily focused RPG experience inspired by classic games (Fallout 1 and Fallout 2) and you can find the teaser trailer for it below.
In Fallout: Nuevo Mexico, players will join several new factions. The mod will also offer three unique companions with an updated companion system. In addition, new activities will appear in the game, and you will be able to travel to different states and locations.
While a release date has yet to be set, the mod looks very promising.