It was one of the first WTF covers from DC Comics to have its gatefold revealed, albeit not officially.
Artist Mico Suayan's agent posted his cover art online, featuring the full gatefold. After Bleeding Cool ran the cover, it was rapidly taken down.
Now, according the book's writer James Tynion IV, who has tweeted a picture of his comp copies, the cover has been redrawn (presumably with a different reveal now) by a different artist and Mico Suayan has been dropped from the book, replaced by Julius Gopez, though the DC website still lists the original cover and creative team.
Jim Starlin did similar with his Stormwatch comic, but that remained unchanged. Looks like next week there will be more people saying "WTF?"