I'm surprised they want to venture into this (stupid) territory again. Their marriage with PowerPC and proprietary rubbish nearly killed them at the end of the last century after intel shot forward in technology and left them light years behind. Only Steve Jobs' business acumen saved them on time.
It's a stupid move. Insane even. We've been through all that - the "unsinkable" hardware giants and their capricious proprietary cack - it's very 20 years ago and very boring - the DEC/Compaq, Cray/SGI, Atari/Commodore - they have their fifteen minutes and then x86 architecture goes next level and leaves them in dust. Whatever temporary advantage Apple think they may have at this moment in CPU architecture is only part of the story. Speed is also in buses, chipsets, I/O protocols, proprietary interfaces. How is Apple going to marry their mobile phone chips to another generation of Intel's thunderbolt or CXL or PCI-Express and other what-have-yous for our laptops and workstations?
Coding for multiple architectures will mean rise in costs for third party software providers, probably to the levels of the previous version of universal binary. For many software makers it will also mean complete overhaul from scratch to adopt new acceleration methods across the board - I honestly can't imagine the amount of work it would take to port all the DAWs, music software, video editing suites and plugins currently on the market to work on both Intel and ARM and let's face it - you won't be running stuff that currently needs low latency and maximum power of your CPU and GPU through a flipping Rosetta 2.
But that's Apple for you - always against their partners, supporters and customers - you want workstation with more space for your drives and cards, they give you "iBin" Mac Pro with exact opposite and turn your entire hardware inventory into scrap in process, you want a laptop with few usable ports and HDMI out, they give you one with the weirdest bunch of proprietary mini-this and micro-that ports that require new dongles for years, you finally want a powerful laptop with more expansion options, and they release a new one with two year old CPU, chromebook graphics and a single usable USB-C port and so it goes for every year. I've spent an equivalent of a three bedroom house in video editing equipment with them over several decades and I haven't been happy with anything I got from them since 2008. I'm tired of it now and I don't need them any more. Sure as hell not moving to ARM.