Reposting JO'geran's post here.
This time stay on topic people!
Chris Avellone has stated that he doesn't think any future Fallout games will be made by anyone other than Bethesda. He seems to be a trustworthy source on the subject, I trust he knows what he's talking about.
Source: https://twitter.com/ChrisAvellone/status/713140991121711104
Bad news guys, New Vegas was the last Fallout Game ever made. We're never getting any more.
Rest in Peace, Chosen Series.
This time stay on topic people!