Lenovo has moved the fingerprint reader from last year; it used to be between the arrow keys and the logo. The X1 didn't like my fingerprint, though; it took a while before it would register, and it never recognized me on the first try, and freqently not even on the second.
My left forefinger naturally rests on the lower left corner of the trackpad -- ready to click-drag, captain! -- but the Carbon interprets that resting position as a click. As a result, I get weird cursor jumpage when I'm trying to navigate with the touchpad. I've had to train myself to rest over and use the left Touchpoint button instead.
The keyboard is a little updated from last year. For instance the Enter key is smaller (but still big enough) and the keys are labeled with text rather than icons. I like the FnLock button, but it's a little counter-intuitive that it lights up when it's not engaged.