From a brief glance I can see, some of the differences are:
2.3
– Ethernet, no Wi-Fi
– 1 sensor port
– no RF port
– USB port
– No OTA Firmware updates?
3.0
– Wi-Fi, no ethernet
– 2 sensor ports (although the firmware only uses one at the moment)
– RF port
– micro-USB port
– OTA Firmware updates?
I am one of those people that like to use Wi-Fi only for portable devices, so ethernet is a big plus for the old version. However, will future firmware updates be compatible with the old hardware?