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Aside from keng2000's very good points, I would very much doubt the Sony USB implementation is able to send power out of the bus to actually power these USB devices.
All in all I'd say Sony's implementation is a bit of a kludge - WTF is up with a device that needs to see an actual host computer before starting to charge over USB?
In a nutshell, I wouldn't hold my breath on this happening, ever.
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