An industry insider has prophesized that Blizzard will announce Diablo 2 Resurrected at BlizzConline, which is set to take place between February 19 and February 20. We could even some new Diablo 4 and Overwatch 2 gameplay at the online-only event.
https://www.notebookcheck.net/Leak-suggests-that-Diablo-2-Resurrected-is-likely-to-be-unveiled-at-BlizzConline.522556.0.html