That 2019 for the Mac is coming was mentioned in response to one of many threads on this subject. I don't have time to look through all of them to find it.
What I am wanting to know is whether PG Music has ever officially stated that BIAB 2019 for Mac was coming - and that it would be 64 bit. I have tried to ask customer support but they were totally evasive. I worry that this major redevelopment might be too hard and not deemed worthwhile.
Since no version of BIAB exists for iOS, I can't imagine we will in 2019. The app called Band in a Box in the App Store is a client app for certain BIAB Windows functionality on your iOS device—not the same thing.
AUv3 is not required for Catalina.
My mistake, I meant to say AU, not AUV3. Many Mac users would be using Logic Pro X and a VST won't be much use. Sure, I would love to see BIAB on iOS but understand that is not viable at the moment due to the state of the legacy code.
I think the rollout to Marzipan based apps will be a lot slower than any of the wishful thinkers would like to see.
What I am getting at is if PG Music were to outline that they were redeveloping this properly utilising the Cocoa framework and programming it with Swift then a number of future possibilities will start to open up. And declarative user interfaces in SwiftUI, along with Project Catalyst/Marzipan, are as close to a magic wand as an Apple developer is likely to find... :-)
I am just hoping PG Music are all in with where Apple is going - but am not feeling confident from my experiences to date. I don't mind if they initially have to launch a very limited feature set providing they have built something on a proper modern framework.