Could one of these be a high end Surface phone?
A while ago, Microsoft patented a phone with an interchangeable slide out part that you could use to swap a qwerty keyboard with a game pad/controller or a spare battery, etc. Could this be a high end Microsoft Surface phone manufactured by Nokia?
The interchangeable parts could also be used to control your phone as a secondary device:
Also, what about the phone that was shown in the Microsoft future vision video? Microsoft has a patent on that and with what we saw during The Verge's trip to Microsoft Research, Microsoft has working prototypes of just about everything in that video.
For those of you that have not seen the video, here is the short version: