This might be what Blizzard meant when they mentioned at BlizzCon that they wanted raid gear to be the best for raiding.
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We've datamined new Shard of Domination "Cogwheel Gems" in Patch 9.1 which have multiple ranks and provide powerful effects when equipped. Each gem seems to be tailored towards a specific role, and we speculate that these might be special loot enchants, possibly from the Sanctum of Domination raid!