Is this the new Canon EF 50mm f/1.8 STM we've been talking about for a few months now? We expect to see this lens announced sometime in April along with a replacement to the non-L, non-DO 70-300 IS.
We're pretty sure it's a fake, as the font used for the “50mm” is the old font Canon used to use. We've been told the lens would have a 49mm filter thread, STM AF and it would be f/1.8. We've seen no mention of IS, which this image seems to show.
The second sign that this is a fake is the zoom marker, a prime doesn't need one of those.