Data Update Mechanism
Have a mechanism to subscribe to data change updates on the platform so applications don't need to constantly poll for changes.

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Andy Nelson commented
@Todd - this would be very valuable for us. I can think of many different scenarios where we would be able to utilize this type of capability from allowing edge devices to check for changes to perhaps update a configuration, through to watching for new data being posted to a stream to allow another process to act upon that stream of data without the need for continuing polling.
And of course polling is a little more network intensive depending upon how much data you are polling for to look for changes and a lot of the edge-to-cloud may be bandwidth constrained (think remote locations on GPRS or 3G/4G connections).