I don't know if Kaveri's iGPU will support TrueAudio but it's possible it will. I know the R7-260x supports it, despite being a rebranded 7790. It turns out that the original Bonaire GPU actually already had TrueAudio tech on it, it was just disabled. No doubt to give people extra incentive to shell out for the "new" GPU, lol.
I know that Kaveri will have an ARM co-processor as well, but what function it serves I don't remember (or if it was even explained what it will do yet).
>>BUT why won't they release it already?
Well Kaveri was delayed a while back (before all the recent delay rumors which weren't really true) for as-of-now unknown reasons. Some speculate yield issues with GloFo, manufacturing issues or what have you, but these are unsubstantiated. Leaked documents and die shots points to AMD having scrapped the initial Steamroller and overhauled it to become bdver3b, or Steamroller 2.0. We will find out in a few weeks time more about Kaveri.
If it were ready for release at this time, I don't believe that Richland would have been released. Richland was a stop-gap to give people something to "upgrade" to while they wait for Kaveri.