[_ea1k]

You are being downvoted, but you are definitely right about the new ones. I'm not sure if they are shipping yet, though.

Details here: http://shop.lenovo.com/us/en/laptops/thinkpad/x-series/x1-ca...

Previous versions did not have one, afaik.

[JoshTriplett]

The last several generations of the X1 Carbon have all had Ethernet ports; the adapters are even compatible between the generations.