I just received the new USB 3 Camera Connection Kit (works with USB 2 as well). I just tested it on an iPad Air 2 with an Apple USB ethernet adapter and it works. There are several caveats though:
- It requires power. I don't know if the older connection kit had a lightning connector but the new USB 3 version does and it has to be plugged in.
- There is no setup. You must be using DHCP and it must automatically retrieve DNS information. For most people this will be normal but if anything doesn't work, there is no UI to change any setting.
- I only tested with Apple's early generation USB 2 ethernet adapter.
- I tested on an iPad Air 2 but since they both run the same version of iOS and have a lightning connector, it should work the same on an original iPad Air.
Links: apple-usb-ethernet-adapter, lightning-to-usb-3-camera-adapter,
Hope this helps.