Of course, although a picture supposedly speaks a thousand words, not much can be mentioned here although we can tell that if this should be the real deal in due time, then the overall design has undergone a rather substantial change. The positioning of the rear flash/heart rate sensor does seem to have moved, which so happens to be located right next to the sensor instead of being under it, and the overall design does seem to be rather flat, accompanied by rounded edges in the corner.
Of course, it does make plenty of sense to take this bit in with a pinch of salt – or rather, throw a handful at it, since this is but an alleged prototype unit. Who knows? The final design could turn out to be radically different, making this but a red herring all this while.