I just installed ubuntu 13.10 on a new x1 Carbon (second generation) and everything works fine so far. I adjusted the touchpad to disable "tap-to-click" and enabled "middle-mouse-button" and just fine tuning the touchpad (it is really bad in the default setup).
Now I have two problems left:
How can I make use of the function key bar? I can use F1-F12 just fine, but with "Fn" you should switch the OLEd to other keys. This does not work. Brightness/Settings/WLAN key does not work either.
How can I enable vertical scrolling with trackpoint and middle mouse button. On my lenovo T530 it worked out of the box.