Blizzard announced all the Season 4-related launch dates in today’s Campfire Chat livestream.
First off we have the new addition to Diablo 4, the Public Test Realm (PTR) for the season coming on April 2nd. The PTR will last only a week, ending on April 9th. The season itself arrives over a month later, on May 15th. This is also when Season 3 will end.
Season 4 is bringing many changes, specifically to itemization. You can read all about it in our Campfire Chat summary here.