Hardcore Diablo 2 enthusiasts will be pleased to know that they can carry forward their progress to Diablo 2: Resurrected. Vicarious Vision's Matthew Cederquis confirmed that older Diablo 2 save files would work with the newer version. This also tells that Diablo 2: Resurrected will come with no new gameplay mechanics.
https://www.notebookcheck.net/Diablo-2-save-files-will-work-with-Diablo-2-Resurrected-according-to-one-of-the-game-s-developers.526388.0.html