Here's Joe Belfiore showing off Continuum on Windows Phone and I have to say it looks pretty good. Whilst you may not choose to use your phone as your only computer, it certainly offers new options for hot-desking that look mighty attractive.
Two things, Windows 10 for Phones will be available "this summer" and new hardware will be required to make this work, some of which Belfiore details in the voice over.
This alone makes a Windows Phone far more attractive than previously thought possible. Let's see if Microsoft can make something of this or whether it turns into another Origami.