Well, so far this gives no hint of anything mid-series in the timeline. This looks like a full-on primitive world like we saw in MM#3. It might not be after #3 but it is probably at least after #2.
I'm kinda disappointed. I actually wanted to see something more in between the world of #1 and #2. The crumbling of the known civilized society would have been cool to portray on a larger scale than they had the resources to show back when they did the first one. Potentially more interesting too. Once you get to the era of #2 and #3 in the timeline it's basically a cartoon. Potentially fun to watch but there's nothing for the adult brain to get interested in.
Maybe they avoided doing anything near MM#1 because of the fact that it originally showed a "near future" of 30 years ago that didn't come to pass quite like that. What would they do, show it looking like the 1970s again and still be calling it the future?
The best way to deal with that problem might be to declare the entire MM franchise an alternate timeline from our own. In the MM world the USA and USSR really did go to nuclear war in the 1980s and nuked the planet back to the stone age.