This could be the upcoming Microsoft flagship

Microsoft is rumored to launch two new Windows Phone flagships in October. While we’ve already seen the device recently, a new picture of the device might have just leaked — alongside a mysterious black box.
The picture was published by the folks over at DrWindows.de on their podcast (at the  01:19:00 mark). Unfortunately, we can’t confirm if the device is indeed, the upcoming Microsoft flagship. As you can see on the above image, the device looks very similar to  renders of the Cityman  and Talkman.  We suspect the device on the above image is the Cityman device. Alongside the device, there’s also a mysterious black box which could be related to Continuum – again, this is just a speculation.
According to previous rumours, the Cityman will pack a 5.7 inch QHD (1440×2560) OLED display, 64-bit Octa core Snapdragon 810, Windows Hello, 3GB of RAM, 32GB of internal storage, 20MP PureView rear camera with triple LED flash, aluminium side buttons, 5MP front facing camera, 3300 mAh removable battery, Qi wireless charging and USB Type-C.
As we’ve stated earlier, we can’t confirm if this device is the “real deal.” However, there’s a very good chance of it being the real thing.
Tom Warren claims that the black box’s codename is “Wizard”. And as we speculated, it’s for  Continuum and  attaching additional  devices:
@mehedih_ @JamilJafri @bdsamsit's the Wizard
— Tom Warren (@tomwarren) August 27, 2015.
Source: WMPU