AUv3 on iOS- what's the deal?

[gorangrooves]

Hey guys,
I've been having difficulty finding clear information on how to install AUv3 plugin on an iPad, for example. On Mac, there is a known path as to where they should be installed. But iOS: where and how?
I know that there are plugins in the app store that can install in the correct location. What I am interested in is how to distribute my plugins in this format. Is it necessary to do it through the App Store? How would it be bundled with the sample library?

Any first-hand info is much appreciated.