The patch will be on the 18th and the new uniques and legendaries added will be live on the Eternal realm on that date.
The season itself goes live on July 20th.
Also, patch 1.0.4 will be live today that among other things will enable uniques to drop from Helltide chests.
https://news.blizzard.com/en-us/diablo4/23967322/malignance-runs-rampant-in-the-first-season-of-diablo-iv?blzcmp=blizzard-news
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Comments
If you loved the launch and like resets then this is great. Otherwise it's less new content than many D3 seasons.
As to "content" compared to D3... I don't remember any D3 season having an NPC with its own quest line of content like this one will have.
Most D3 seasons just had stuff that was more like the positive and negative traits on Nightmare dungeon sigils that are in D4's base game. Some were even just double bounty caches lol.
“Microtransactions? In a single player role-playing game? Are you nuts?”
― CD PROJEKT RED