Usually all of the Apple rumors go on before WWDC, but yesterday saw the opposite! A single frame of video showed the words "Inter-App Audio" and rampant speculation followed from every corner of the web.
Instead of repeating the rumors, I actually spoke with developers about this. They have to remain anonymous as there is an NDA for Beta access, but I assure you these guys are the real deal.
"After pouring over the documentation and looking at function calls, we can't find anything of the sort in iOS 6 yet! It might be in there, but Apple isn't helping us find it. There is nothing about audio in the release notes. Everyone should calm the fuck down and wait for actual news about this. Developers can't talk about it yet, so give us time." - Anonymous iOS Developer
Keep in mind this is the first version of the beta, so this does not mean that it won't make it into the final. A lot of the functionality we heard about yesterday isn't in yet. The Passbook app, for instance, is merely a place-holder icon in the current version.
Developers at WWDC have been contacted to seek comments from Apple Engineers. Hopefully we'll learn the real shape of this soon.