@Mike Valeriano , Thanks for posting this question.
I'm checking on this with our product engineering team internally and will get back to you shortly.
Typically, the runtime announcements are shared on the following App Service space:
https://azure.microsoft.com/updates/?product=app-service
https://github.com/Azure/app-service-announcements/issues
Also, kindly refer this document OS and runtime patching in Azure App Service for more details on the topic [FAQ: Which OS and runtime versions are running your apps].
As a side note, we have Node 14 LTS (Preview) available on Linux App Service today.