well, you could check it precisely …
as well as @milek7 - he contributes to ARM64
ARM and ARM64 progress parallel and together as well
There are works on EFI loader progress, and differentially the kernel as well.
Also the supports of platforms in kernel started to separated that way some codes get out from x86 or x86_64 what can be used in ARM or ARM64, RISC-V as well.
Some parts must be rewritten as ARM, ARM64 or RISC-V use different methods (HW/SW) to help device detection/configuration during boot and addressing - so those should be developed. For example PCI is not really so important as in PC machines regarding to interfaces, but of course exists - if I understood well from comments in patches and the discussions in forum posts.about EFI / ARM progress.
I think it would worth to write an article about in a blogpost to cover what happens and will happen for those people in the community who cannot spend time to read all those things on forum and other available sources.
Yes, you are right : we get portions of ARM and RISC-V news in every monthly update reports - but as it is overall progress of Haiku not the best place for write about some roadmap - like progress or enhancements in this topic.
But of course I think as those who develops actually - they would rather write the new codes or enhance the existing code to use their available time efficiently - I do not know who could write an article about it …
who knows the problems and the gains Haiku has actually and have enough time to write about it in a wider prospect.