I cannot find any page that present the feature road map for PowerApps. Maybe you could post this idea in the PowerApps Ideas forum, so it might be considered for future releases.
This is the slide used to show the roadmap in November 2016. I cannot find any live links to an official roadmap at this time.
Is 'preview of dynamic forms' going to arrive for the holidays?
I couldn't find any offical article about the detailed roadmap of PowerApps either.
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Features releasing from October 2019 through March 2020