The ThinkPad X1 series has already been updated by Lenovo, but not the regular T & X series ThinkPad laptops. A listing at the TCO certification site reveals the first details about the upcoming ThinkPads: The X13 Gen 2 adopts the taller 16:10 aspect ratio, like the ThinkPad X1 Carbon. The bigger T series meanwhile continues to use wider 16:9 screens.
https://www.notebookcheck.net/2021-Lenovo-ThinkPad-leak-X13-Gen-2-with-16-10-aspect-ratio-T14-T14s-Gen-2-stay-with-16-9.517986.0.html