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Early access to the Diablo IV open beta test is scheduled for March 17 through March 19.

From March 24 to 26, all platforms will be available for an open beta test of Diablo IV, according to Blizzard Entertainment. Those who pre-order the game will have early access to the open beta test from March 17 to March 19.
The prologue and first act, both situated in the "Fractured Peaks" zone, will be included in the open beta test, according to Diablo IV director Joe Shely (via IGN). Characters can level up to level 25, at which point both main and side quests will be accessible. Progress in the test will carry over for early access gamers between the two beta weekends.
more further information on the public beta test.
On June 6, Battle.net will release Diablo IV on the PlayStation 5, Xbox Series, PlayStation 4, Xbox One, and PC.
See a brand-new trailer below.
Diablo IV | In-Game Intro Cinematic