Which devices and iOS versions do support iAP2? Is there any information available about; which devices and which versions of iOS do support iAP2? (iPod Accessory Protocol 2 - 7th Chapter)

Is this information available on the phone? Can you somehow look it up, if the phone supports iAP2?

I would like to test some of the features of this new version.

Thank you very much for any help.
The technical specification for iAP2 is only available to the members of the MFi licensing program

This information can't be found on the phone. Most of the devices with up-to-date iOS version should support the protocol, but the actual list and technical details are only available for the members of the MFi licensing program.