IIUC the Yoga Book keyboard is fixed QWERTY image that can be backlit. And it's a flat touch surface, no moving keys.

The Sonder keyboard has the holy grail combination* of movable keys and ability to change their labels. Others have tried this, but not like this (Art Lebedev used a display per key, which was extremely expensive; Tactus use microfluidics to raise bumps on top a touchscreen but don't quite qualify as moving keys).

* Yes, the sceptics here have a point that looking at your keyboard is not very necessary. Whatever, I want it :-)