Logging available for tracking activity in Flow & PowerApps?

Yes, PowerApps will become part of the audit log in the near future.

I already replied to another thread about the PowerApps and Flow admin capabilities already there and coming. https://techcommunity.microsoft.com/t5/PowerApps-Flow/MS-Flow-logging-monitoring/m-p/227717#M1397

My response:

Since a couple of months there is a PowerApps and Flow Powershell module available. Check https://docs.microsoft.com/en-us/powerapps/administrator/powerapps-powershell. The cmdlets will not give you the internal structure of the Flow, but you are able to get Flow runs (Get-FlowRun) or get used connections (Get-PowerAppConnection).

There are also a whole bunch of administrative cmdlets but without a P2 these cmdlets only give you info about Flows that are made by or shared with your user account. With a P2 and the correct administrative role in O365 and the PowerApps/Flow environments you can get info about the Flow that are not shared with you.

With a P2 you can also use the Flow management connector (https://docs.microsoft.com/en-us/connectors/flowmanagement/): administering Flow by using Flow. 

A similar connector for PowerApps was announced during the Business Application Summit a couple of weeks ago. With these two connectors combined you can build your own PowerApps and Flow admin center using PowerApps and Flow if you want something else than Microsoft provides.

An on-demand session on this topic you can find here: https://www.microsoft.com/en-us/businessapplicationssummit/video/BAS2018-111120. 

Also - have a look at PowerApps/Flow DLP policies: https://docs.microsoft.com/en-us/powerapps/administrator/create-dlp-policy