Those were the warfront basic gear, which makes sense as the whole point of the warfront armor was it was basically the same niche as the heritage armor, an armor set built around the "race" represented, which is why people assumed orc/undead + human/nelf would be the last ones to get their heritage armors, if ever, because the warfront armors already pretty much covered that.
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Heros of the storm already had it funnily enough for the Cho'gall master skin which represented both the Horde, and the Twilight Council.