I just purchased a Lenovo ThinkPad X1 Carbon Touch and replaced the installed Windows 8 with Ubuntu 13.04. Everything worked out of the box, including the touchscreen. 13.04 isn't really touch-optimized -- you have to hit the scroll bar to scroll a window with touch, for instance -- but that's not the hardware's fault, it recognizes the touch event just fine.
I haven't tried the 13.10 betas on it so I can't say for certain how well they will work on the hardware, but given how solid 13.04 is on the Carbon Touch I'm optimistic that 13.10 will work well too.