Power over ethernet - no, the 4 wires not used for Ethernet are terminated in the device but aren't connected - personally I'd love to see a couple of them available for this purpose.
The onboard micro also runs on 3.3V so you need to have a power convertor to 3.3V from a higher voltage as well.
And it can suck the juice - up to 210mA - some of that probably to run the Ethernet magnetics etc.