@evleaks would be the party behind this reveal, where it shows off the front-facing flash that has been speculated for quite some time already. It does look just a little bit like the Lumia 830 which it is supposed to replace, where the sharp corners are no longer the case as those have been replaced with more rounded ones, making it more in line with what its higher end siblings look like.
There also does not look as though there are any capacitive keys located under the display, hence the onscreen navigation should not remain a top tier exclusive. As for the hardware shutter button, that also looks to have taken leave, but we won’t really know until the real deal arrives. All that we can do now is to sit tight and wait for Microsoft to officially reveal the Lumia 850.