So a bunch of us went to the Fujiya AVIC Summer Portable Audio Festival and I had a chance to chat with the Fostex guys about the HP_P1.
I asked about future firmware updates and they said that they're working on something for iPod Nano users because the Nano usually runs about 16 hours without amplification but that when paired with the HP_P1, the Nano ran down in only a few hours.
They asked me if I would pay for a firmware update that allowed the HP_P1 to charge my iDevice. I said I'd consider it but only if it didn't affect SQ.
The challenge is that any charging of the iDevice via an external source also invariably injects noise into the system so that's the balance that they're dealing with. They'd like for the HP_P1 to be an external power source but the impact to SQ is the concern.
I told Fostex politely that the OEM case sucks and that they need to come up with something better. IMO it's completely worthless.