So is tge dome/broken dome where we climb out after opening the vault door

Gun shelf/garage-player home and storage including power armor display?

Also we appear to be following the kid with baseball cap who appears to get
Locked out with us

No beards based on screenshots.

I fully expect this game to start with you as the protagonist (either wife or husband from the trailer) running to the Vault entrance because of the Nuke that is about to going down nearby. Once you're there you'll be facing the actual Nuke impact and explosion (like in the trailer) but the blast will not kill you or your family. (Notice how the trailer fades out once the blast hits the entrance). Instead everyone will be in shock and suriving it. The explosion itself doesn't mean HURR DURR you're all radiated now! Because the radiation itself just released on ground zero and is slowly startng to spread out which means...if they survived the blast they can still quickly get into the Vault and yeah...you get it.

However I think the rumours with Vault 111 being a cryo-statis Vault is true and you will wake up somewhen 200+ years and notice that your family is gone (If you play the mother you'll see father and son being gone, if you play the father you'll see mother and son being gone) --> which will lead to you exiting the Vault with the same elevator entrance that you used to get in the Vault (Trailer indicated that you'd be entering the world of Fallout 4 with the elevator). Your mainquest: find yo wife/husband and son...which will further lead to the story unfolding in a much more complicated way and not just being about you and your son. Probably something with Androids vs. The Institute which is heavily hinted at.

edit: oh and modders will mod the hell out of those flying ships

You get that those were the poeple who didn't get in before it was closed?Btw you noticed the corpses arround the enterance area when the dog passed by?

Yes, yes I am.

Probably lol. But I still think that you'll get to play a family from pre-war area.