While it did not provide details regarding the actual settings or framerate targets, the minimum and recommended PC system requirements for Fallout 76 are significantly higher than ones for Fallout 4, most likely due to an updated version of the Fallout 4 engine.
According to earlier details and some of the recent previews of the game, you can expect better rendering and better lighting, at least compared to the Fallout 4.
In case you missed it, Fallout 76 is an online-only multiplayer game will have a solo mode and promises to be four times larger than Fallout 4.
Both the minimum and recommended system requirements will require a 64-bit Windows 7, 8.1 or Windows 10 OS, 8GB of RAM and 60GB of storage space. The minimum starts with Intel's Core i7-6600k or AMD's Ryzen 3 1300X CPU as well as either an Nvidia GTX 780 or Radeon R9 285 graphics card. The recommended specifications are Intel's Core i7-4790CPU with AMD Ryzen 5 1500X as the other choice. The recommended GPU is either the Nvidia GTX 970 or AMD R9 290X.
As said, this does not mean that you will get all the eye-candy at 4K/UHD resolution, but hopefully, we will get a clear picture as the B.E.T.A (Break-It Early Test Application) phase starts on October 30th. Of course, B.E.T.A will be available only for those that have pre-ordered the game.
Bethesda already said that users can expect "spectacular bugs and other issues" from the B.E.T.A phase as it is still an unfinished game.