This April, DC's doing a big thing where legendary MAD Magazine artists (which Warner Bros. also owns) are doing variant covers for New 52 books, and perhaps the most famous MAD artist is Sergio Aragones. Therefore, it makes sense that he'd get to do a variant cover for Justice League #19, due out April 17.
Check out Crave Online's exclusive first look at Sergio's cover. Note the Spy vs. Spy jammies! Fun times!