Good question. I got the same email today although my station is a WS-2000 and I am not familiar with the 2902 consoles. But from what I can tell, Ambient has had several hardware revisions of the 2902 series weather station and console .... 2902, 2902A, 2902B, 2902C and now 2902D.
In poking around on the web, I did find this explanation from an older atricle:
"In 2018, the Ambient Weather WS-2902a took its place as the replacement for the WS-2902. The addition of direct console Internet access to the WS-2902 makes it easier to connect to a dual-band router. To connect with your router, the WS-2902 employs AmbientTool, which is a mobile app. This is the biggest change in the ambient weather ws-2902a osprey."
EDIT: It must be lots of people were confused by Ambient's 2902 email message. They have now sent out a more detailed message stating that the issue only affects the original 2902 console (the model without a letter designation). Those with the A, B, C and D consoles will not be affected.