Just like they did before with the transition from PowerPC to Intel. Interesting times coming for sure. It will take a few years before they finally phase out support for their current lineup.
Needless to say. DO NOT UPDATE your Mac to macOS 11 until the makers of the software and hardware you rely on have stated they are compatible. This is a major transition so expect things to be rougher around the edges for early adopters.
Not that I’m aware of but I honestly haven’t been keeping a close eye on ARM progress. In theory Rosetta 2 translates the app during install to help keep some of the performance but there’s no way to know how well tasks that require the complex instruction sets will respond. Guess time will tell? I’ll be sticking to my 16" for a fair bit regardless.