The interesting part is "Ubuntu will primarily run on a foundation of native Windows libraries."
If this is true Canonical is playing with fire. That could be the embrace step of the usual embrace-extend-estinguish script. Think what happens when Microsoft adds some new functionality to those "native Windows libraries" and Ubuntu/Windows is extended to use it and Ubuntu/Linux obviously not. If (when?) the majority of Ubuntu's users will be on Windows Microsoft only needs to start developing its own Ubuntu and cut Canonical out of the loop. If there will be a significant amount of Ubuntu/Windows servers by then, very little will be left for Canonical. Only the cost of Windows licenses can save Canonical on the server. The desktop will be lost given that most of Ubuntu's desktops are born as Windows machines. The more convenient way will be to add Ubuntu/Windows to them and keep a Windows OS for games or just in case you need some Windows native application.
Maybe Canonical is thinking about leaving the desktop and focusing on the server. Still it's a risky move.
Another interesting post of October 2015 http://www.linuxjournal.com/content/ubuntu-conspiracy "The word is that Microsoft is in secret negotiations to purchase Canonical." Maybe they're playing the Elop move without having to change CEO.