Theme is selfexpandable. I guess industrial board may be powered with POE.
Can it be done, some how, with D revision.
Are you planing to add this future?
There is no PoE on A64-OlinuXino boards. We have no plans to add such at the moment. You can extract PoE with additional extractor that converts PoE into 5V, like MOD-POE-V2:
https://www.olimex.com/Products/Modules/Ethernet/MOD-POE-V2/