Tangent query regarding iOS.
Were there any updates/announcements about native development or C++/Swift interoperability in recent WWDC16 talks.
They announced which upcoming parts of macOS have been re-written in Swift. The dock and a few daemons were part of the list.
They are very keen in focusing on Swift going forward, but with a good interoperability story with Objective-C, thus making Swift/Objective-C a duo similar to .NET/C++ on Windows.
No information about interoperability with C++. Your best way is still Objective-C++ as a mean to create Objective-C friendly bindings that can be consumed from Swift.
You can watch the sessions here
https://developer.apple.com/videos/wwdc2016
If you don't have the inclination to watch them, most have slides available as well.