Here's what Intua have to say:
We would like to clarify the situation regarding Audiobus. We understand everyone is hyped about the integration in BeatMaker 2, so are we ! Don't worry, Audiobus will be added in 2.4.2.
As you might already know, we were working on a maintenance update (2.4.1) to address some stability and user experience issues. This update has been submitted to Apple a few days ago. This was mandatory for us before diving into Audiobus.
We will be working closely with the Audiobus team to get both great user experience and stability. Yes, it is already working in our betas, but we are aiming for a perfect integration.
I hope everyone understands the situation. We are as excited as everyone about Audiobus!