Apparently it's "just as focused on the story as any other Bethesda Game Studios game".
According to Amazon, the latest version of the post-apocalyptic cycle would have its debut on July 31 this year. Currently, the product card already has the date December 31, 2018, which means that the store expects to start selling this year. Of course, it is worth waiting for the publisher's official message. It is possible that the release date is one of the details that Bethesda will keep secret until the start of the conference on E3 2018.