The image itself does look rather shaky on grounds of authenticity, as it does not measure up to Microsoft’s house-style where device renders are concerned. Normally in the past, Lumia handsets tend not to be shown as though it is placed on an invisible hoverboard, and the images from Microsoft do lean toward being shown at an angle while being placed on a bright white surface.
Of course, if we were to take Zac Bowden’s effort at watermarking the image into consideration, it could very well be the real deal in due time as Microsoft offers something more concrete for us to work with, but until that happens, it would be best to take everything one has read about the Lumia Saana (which isn’t much to go by, really) with a generous pinch of salt.