All,
The Wi-Fi Alliance "launched" the Wi-Fi Peer-to-Peer Services program and technical specifications last night, so they are now available (for purchase, unfortunately) from the Wi-Fi Alliance web site at:
https://www.wi-fi.org/wi-fi-peer-to-peer-services-technical-specification-package-v11
Among other things, these technical specifications define how you do (IPP) printing over Wi-Fi Direct.
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Michael Sweet, Senior Printing System Engineer, PWG Chair