Audiobus 3 has been released and the previous version has been rebranded Audiobus 2 and updated to v2.4.1.
Audiobus 3 is a major new version of the inter-app audio routing system for iOS and features a completely new MIDI routing system, support for Apple's new Audio Unit Extensions standard, a new built-in mixer, and "huge new workflow improvements".
Minimum requirements are now iOS 10.2 or later (Compatible with iPhone, iPad, and iPod touch). It costs $9.99.
Watch these videos for more details: