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New Raspberry Pi 5 comes with PCIe 2.0 x1 interface and power button
(www.raspberrypi.com)
This is a most excellent place for technology news and articles.
Olimex had a ARM board with POE, if I remember correctly... though I cannot find it atm. Here's an ESP based instead: https://www.olimex.com/Products/IoT/ESP32/ESP32-POE/open-source-hardware