An encrypted Diablo II: Resurrected Internal Alpha build was deployed today in the Battle.net Launcher — as shown at BlizzTracker.
There is no official release date other than it will launch within 2021, and no date when Diablo II: Resurrected external closed beta begins. But on PC, Blizzard has been consistent in transitioning Alpha to Beta within 77-100 days from the day Alpha begins.
We will see how that pans out, or whether Beta is much closer… say April? Stay tuned. Follow @blizzplanetcom for updates.