I remember hearing Adam would do a post-credits cameo in Aquaman, but nothing about JL.
Anyway, Hollywood Reporter is saying Shazam will indeed be the next DCEU movie after Aquaman. They're also reporting that Black Adam won't be in it.
http://www.hollywoodreporter.com/amp/heat-vision/shazam-is-next-dc-movie-shoot-1022821
If you really think the moderation here is bad, you clearly didn't read the Wonder Woman nor the Spider-Man Homecoming threads. Mods were on high alert in those threads because of the Marvel/DC bullshit. Tele himself had to go through pages in the Homecoming one and delete posts derailing the thread.
And damnit, I LIKE POSTING IRRELEVANT GIFS!
HAVE ANOTHER!