This message has been posted on their discord server yesterday, currently the app is being worked on and has no definitive ETA. We probably have to use other forks until that. I don’t know whether I can share the discord server’s link so not sharing that until a mod gives heads up.
I just refuse to update Tachiyomi so it still works for me.
it still works for you because the external extensions are still working, all we can hope is for those external extensions to work properly until we get a proper replacement.
Temporarily, you can use this repo for extensions.
I did a bunch of downloading of stuff I plan to read before the extensions stop working. Should give me time to wait to see what develops until then.