You won't get an official answer here, PA does not make release comments in public forums. So if you need an official answer contact your sales engineer for an NDA discussion.
Generally I've seen the PA support kick in around 6 months after an MS launch. So I would expect to see this support soon as Server 2016 was released in late September.
Secret target support dates aren't terribly helpful when you're trying to plan deployments.
This is further confused when the TS Agent lists XenDesktop 7.x but not Windows Server 2016 (which XenDesktop 7.x supports).
You would have to speak with your SE; anyone who has this information is not able to give it out in a public forum as they would have needed to have an NDA discussion with their SE.
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