FxOS could very well add GPIO. Bluetooth is currently in the works for FxOS v1 (it'll be certified apps only for v1, but it should expose RFCOMM sockets all the way up through JS, so the potential is there), and host-mode USB has been talked about for later versions. Basically, the idea is "if it's the phone, we should be able to access it". As things branch out, hopefully that'll morph into "if it's on the hardware, we should be able to access it"
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FxOS could very well add GPIO. Bluetooth is currently in the works for FxOS v1 (it'll be certified apps only for v1, but it should expose RFCOMM sockets all the way up through JS, so the potential is there), and host-mode USB has been talked about for later versions. Basically, the idea is "if it's the phone, we should be able to access it". As things branch out, hopefully that'll morph into "if it's on the hardware, we should be able to access it"