It's worth noting that this doesn't have the curved screen rolling onto the edges of the devices that's expected to be included with the flagship smartphone. But that doesn't mean the photos aren't real. When Samsung has used the curved designed before for one of their phablets, they've marketed two models — the Samsung Note Edge along with the regular, non-curved Samsung Note. If real, these photos prove we should be seeing both the Samsung Galaxy S6 Edge and the Samsung Galaxy S6.
Here's a photo of the curved screen design used on the Galaxy Note Edge: