One of the coolest parts of the series is the "world of tomorrow" look. Much of Fallout 3 did an awesome job at that with nifty Googie architecture, but arguably at times there was too much retro and not enough futurism (i.e. I think they should have been a little less "Leave it to Beaver" and a little more "Jetsons") From what I've seen of fallout 4, they seem to be going for a more early 60s aesthetic than they were before and they are being more futuristic. The mailboxes aren't wooden and have a sleek, metal look. The houses aren't complete Levittown rip-offs and look slightly modern. The cars are less bulky and have a slimmer, 60s look. I kinda like the change, it makes Boston seem a little more high-tec (which is fitting for the home of the Institute). I hope they say consistent with that style and don't stick generic looking sci-fi stuff in (looking at you, D.C. Enclave Power armor).