Knowing that the current warehouse mobile app has the advantages of using native device hardware and flexible form rendering from interpreting classes from Dynamics (specific UI control), I would ignore these rumors.
Making customizations and extensions with the current app is better. How would you manage the merge of multiple ISV solutions, some partner customizations, and your development in one single Power App?
I haven't heard any sound from Microsoft either. Microsoft had a choice a few years ago for a native phone app or go for a Power App. It was a conscious decision to go for the current warehouse mobile app.
However, Microsoft can surprise friends and enemies...
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