But of course, it’s tradition, and 2020 will likely be a redesign year to boot!
They’ve honestly probably been working on it for years, I expect they were tinkering with MacOS on arm even before iOS launched - it is basically a fork with a touch interaction layer added if SJ is to be believed. If their chip team can make such an impressive A10X with an <5W TDP, imagine what they could manage given 15, 28 or 45 to play with! That should put their chips in a position to emulate all but the most demanding x86 software - remember the windows 10 ARM version was running on a snapdragon 835, literally a mobile phone chip which explains the sluggish emulation. I expect a highly optimised ‘Rosetta 2’ running on a super-powered octa-core Apple A13M chip or something would probably be a pretty decent interim experience.