Patch 10.2.6 already went live last week, though Season 4 is also a part of the patch and has yet to be tested on the PTR.
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The Dragonflight Patch 10.2.6 Public Test Realm has been reactivated and partially updated for Season 4! Although item test vendors and raids have not been updated for the fated season, Mythic+ keystones changes are available for testing.