Hopefully my question doesn't get lost in the sea of off-topic Yoda posts, but..
Does anyone know if apps being submitted to the app store of iOS 9 features? Or if they're allowed to include those? I know in previous years that was a big no no, but with them releasing public betas, I'm wondering if that's a thing of the past now.
Specifically, I'm wondering if the picture-in-picture might happen for YouTube, Plex, Netflix, etc before the fall*
*Obviously this depends entirely on the developer as well.
1) Get over yourself
2) I don't think you understand how software development works. Developers are getting their first exposure to iO9 and El Capitan now just like the public. They have to create alphas or betas of their own apps to test on the new features with. They will not release these until they are stable and that won't be until the OS is stable.