Cluster rendering was demonstrated at the Esri UC Plenary and looks like a great capability. Would like to see this renderer added to the desktop products.
Great thought. Never going to happen. All new development is going to Pro. ArcMap is dying on the vine.
We've marked this as In Product Plan, but note that as John stated, this will be functionality going into ArcGIS Pro.
Is there a time frame for this update? Not having this tool is really frustrating. Would also like to see the symbology in the 'Summary Viewer' web app template made available in online maps or other configurable app templates.
This functionality didn't make it into Pro 2.3 which will be out in January 2019. So hopefully in the release after that.
Sounds like you're interested in Web Maps - labelling count of clustered features
Retrieving data ...