Recently Karune posted a fairly large update and included in it some screenshots of Zerg units that have been updated recently with improved art. Check them out below; they look much better than previously with additional detail in almost every aspect!
Quote from: Karune (Source)
Art Updates
The StarCraft art team have been making massive updates to the Zerg
faction, adding various new animations and improving even further on
the textures of Zerg units and buildings. A picture is a thousand words
so check out the updates for yourself!
Baneling
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Drone
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Hydralisk
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Overlord
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Overseer
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