Amazon has posted a placeholder product published by Bethesda Softworks for PlayStation 4, Xbox One, and PC. The product is available in standard, Deluxe, and Collector’s editions.
The following Fallout-style countdown video, which is free-to-use stock footage, is attached to the listing:
https://www.youtube.com/watch?v=u7gf6_85-jQ
As for what the product is, we could not say for sure. However, with Fallout 76 having launched in November 2018, a brand-new Fallout title is unlikely. That said, a remastered Fallout 3 or Fallout: New Vegas is much more in the realm of possibility. If Fallout-related at all.
Thanks, @Wario64.