I notice on the video of the Maker Fair presentation that it was mentioned that the ethernet board had "proper" 802.11af POE. Does this mean that we have to use 48V active injectors, or will they operate with the passive injectors used by so many other boards. I ask because the cost of the active injectors. Or have you also produced a cheap 48v active injector.
What would be really nice would be a jumper to allow active or passive, and possibly for the passive injectors to allow lower voltages (18v seems a favourite but 12v or 24v would make for easier use with batteries).
In the video I saw (I don't know if it was the same one) there was mention that the PoE support would be in an optional module. I assume that means there'll be flexibility in terms of what sort of power you can send to it, depending on what module you use.
That's exactly the approach I took with the Freetronics Ethernet shield: the idea is that you can use a cheap passive injector to send up to 12V down the wire with no extra module required at all, just jumpers, or with extra modules it can operate with higher voltages including 802.3af active injectors.
I assume the Arduino team are planning something conceptually similar. What would be super-nice is if they used the same header format so it would be compatible with existing daughter-boards designed for the Freetronics shield and vice versa, but I doubt that will happen.