While the chassis will remain the same, internal options will be updated from 12-core Xeon and Quadro RTX 6000 options to 28-core Xeon and Quadro RTX 8000 options for massive gains in performance. Units will begin shipping before the end of this month.
https://www.notebookcheck.net/Lenovo-ThinkStation-P720-and-P920-desktops-get-2nd-gen-Xeon-Scalable-CPUs-and-Quadro-RTX-8000-GPUs.420047.0.html