Another post somewhere said they were filming Fallout near their home, it showed the red rocket gas station just like FO4, not conclusive but I'd be guessing they'd be heading it off of FO4 timeline since there are more gangs/factions to call upon. Not to mention story content is already written and would run less of a risk of story conflicts/inconsistencies.

Just my 2 cents. I could be completely wrong lol

Found the post

https://i.redd.it/4u3l164yh2ea1.jpg

Could be at any stage since Red Rocket existed in the world lore for a long time. Fallout 4 just showed us one area where the gas station existed. So it's possible.

Yeah I realized that after I posted, I think it was more focused in FO4, my main theory for it being more FO4 based is that it was more recent and probably more identifiable, personally I hope for a new storyline instead of DC or Boston or New Vegas, even though I loved DC and NV. Boston as alright. Still hyped for it and hope it does well

Maybe we could have another setting not seen before like Canada or some other part of the world for Fallout. There's so much potential with the series especially now that we get to see it through the eyes of a Ghoul who's our Main lead.

That's really cool, I know a LOT of shows film in Vancouver and I wonder if that's where they are filming.