https://gamerant.com/bethesda-fallout-5-early-plans/ From GameRant: "This is hardly the first time someone suggested Bethesda should let another studio develop the next Fallout game. The most likely alternate developer would probably be Obsidian Entertainment, makers of excellent RPGs like Fallout: New Vegas, Star Wars: Knights of the Old Republic 2, Neverwinter Nights 2, and The Outer Worlds. Fallout fans have been hoping for another Obsidian-Bethesda team up for years. That seems more likely after Microsoft acquired both studios. However, Todd Howard downplayed the likelihood of that event, saying, “Fallout’s really part of our DNA here. We’ve worked with other people from time to time – I can’t say what’s gonna happen.” So, while Howard didn’t completely dismiss the possibility, it seems like Bethesda prefers to keep Fallout in-house for the foreseeable future. "