The shown prototype mock-up indeed has a 16:9 screen. But as you can see in this slide, Lenovo originally planned it with a 3:2 screen.

Where's the 3:2 screen? All I see is 16:9 garbage.

Very interesting, thanks a lot!

While I'd love for ThinkPads in general (and particularly the ultraportable X series) to move to 3:2 displays, I think they made the right decision here. The concept would make more sense as a replacement for the X2xx series, but they'd need to add back some ports. That bottom-dock expansion module would make typing on this a precarious exercise, making the whole laptop very unstable. And while a 3:2 12" display should be far superior to a 16:9 one, it's still tiny. I hope they go the compromise route: make the next generation of X1 Carbons 14" 3:2. The new X1 tablet made the switch, which is seriously making me consider getting one even at its price.