The title pretty much says it all. When the other characters (I know of at least Batman, Flash, Joker, and Green Lantern) reached this anniversary, they were given company wide variant covers for all the top core DC Comic titles. With the company having shown a spotlight on this very anniversary at the Comic-Con, I would think there would be some mention of this somewhere, assuming they'd continue the policy. If not, it is highly suspect that they'd stop it with Wonder Woman, since Flash and Green Lantern aren't 75 years old when you view only the Hal Jordan and Barry Allen versions (their superheroic names of Flash and Green Lantern are though.) They even did one for Harley Quinn, so I just assumed of course Diana would get the same treatment.