Definitely fake. Compared to the new 24, 28 and 35mm IS lenses, the font for "50mm" on the front of the barrel is wrong. They probably just 'shopped the 35mm f/2 IS, as the distance scale comes directly from it.
A pretty lazy attempt- just compressed the 35mm pic horizontally (henced the compressed font on 50mm) and changed the 35 to 50.
Yeah, even the surface bumps match.