Diablo 4 Season 4

Blizzard has not yet announced the theme for Season 4, but an initial Public Test Realm release will feature tweaks and overhauls to certain mechanics before a full reveal. Changes include a rework of the Codex of Power where now every single Legendary Aspect will be available, rather than a select few. Tempering is also being added which lets you attach stat-boosting or effect-applying Affixes to gear items. Masterworking will be for late game gear refinement and that includes Unique tier, which otherwise can't be Tempered or Affixed.