Wow. Holy crap. Wow.
“Right now, this means that you can carry a smartphone – like the new Lumia 950 and Lumia 950XL – and use a small dock or wireless dongle to connect it to a keyboard, mouse and monitor for a familiar PC-like experience. Run Office apps, browse the Web, edit photos, write email, and much more.”
“While you’re working on the larger screen, you won’t lose your phone’s unique abilities. Continuum multi-tasks flawlessly so you can keep using your phone as a phone for calls, emails, texts, or Candy Crush. Or if you don’t have a mouse, you can use your phone as the trackpad for the apps on the larger screen.”
More info on Continuum: https://blogs.windows.com/windowsexperience/2016/01/14/continuum-for-phones-making-the-phone-work-like-a-pc