Hombre, tanto como "mucho tiempo", no sé...
El artículo se refiere a la implementación del modelo Audio Units en iOS con la llegada de iOS9 (o en su expansión, ya que InterAppAudio ya se basa en AU).
iOS9 llegó hace sólo una semana o así, y en efecto, ha llegado sin que este tema esté acabado. Es de suponer que llegará con alguna actualización, pero nada indica que se hayan echado atrás. Sale a relucir por ejemplo en esta entrevista a varios desarrolladores:
http://audionewsroom.net/2015/09/ipad-pro-mobile-music-apps-and-ios-9-qa-with-ios-developers.html
iOS 9 has just been released today. We’ve heard of significant changes regarding audio apps routing/management. What iOS musicians should expect from this release, also in terms of integration with desktop DAWs and plugins?
Michael:
As I mentioned, Audio Unit Extensions is the new technology to keep an eye on. Apple needs to do a little more work on it before it’s ready, but I think it’s a very interesting direction for app-to-app audio, both from a workflow perspective and for robustness and reliability. Watch this space…
Sebastian:
We’re still waiting for Apple’s own system Audio Units on iOS to become compatible with the new Audio Unit Extensions. Until this arrives, many apps will face significant hurdles before their developers can make them compatible. I’m also wondering if users are going to accept (read: pay for) completely new apps that just act as containers for AU Extensions.
Oliver:
It looks like iOS and Apple desktop music are getting closer to each other, which is good. The announcements sounded pretty exciting, like AudioUnits that you can use on iOS AND Desktop. But I have heard that the needed frameworks are not at a final state yet – lots of bugs, that Apple should fix first. So I guess it will take some time before we get some new technologies / apps that make use of these new features.
.....
Que, traducido, viene a decir que están en ello.