We actually got wind of this some time during the launch of the new LEGO brick built road plates that replaced the older baseplates.
There seems to be some legs to this rumour as there are a few retailers who are saying that the current selection of LEGO baseplates had their EOL (end of line) dates pushed up to February 2022.
While some are calling this an end to the classic LEGO baseplates and heralding a new paradigm shift in the LEGO system, I feel that it could be that LEGO is consolidating their manufacturing processes.
Either way, we do have less than a year to stock up on the colours that we need for our dioramas. I definitely need to get my hands on a few more white baseplates for my winter scene.