In the WWDC, Apple declared that to get the software to run on Apple Silicon (new ARM cpu based systems), developers will need to recompile their existing Intel-based source code for the new architecture. However in short term, of course there will be a transition from intel to arm cpus.
You should read this article: https://www.pro-tools-expert.com/production-expert-1/2020/6/25/apple-silicon-a-developer-helps-to-unpack-what-we-know
By the way, Apple announced an ARM based Mac Mini for developers a couple of months ago (Developer Transition Kit). So the developers can test their software on the new system from now. It has beta versions of macOS Big Sur and XCode.