User blog comment:Atvelonis/Starfield Announced at E3 2018/@comment-31911847-20180614064006/@comment-25356303-20180614224639

I've heard that BGS Austin is the studio mostly responsible for Fallout 76 development, which would indicate that the studio in Rockville has been working on Starfield since 2015 or 2016, after Fallout 4 was released. That would mean a 2019 release date probably isn't totally impossible, although I think I agree that 2020 sounds more likely. TES VI is probably coming three or four years after Starfield, I'd say.