Well, if the Red Skull truly isn't coming back then they might rework Crossbones as something of a fanatical successor. That, of course, would likely draw comparison's to Nolan's version of Bane taking over for Ra's (and it wouldn't help that the two characters look very similar). But that could be the direction they're headed.
Also, check out the trailer to Lay the Favorite. Grillo is in it briefly, and he's already looks JACKED.
ATTENTION: The rumor about WB's "no jokes" policy is 100% correct. No one should ever doubt any rumor about any upcoming movie, even in cases where it contradicts rumors that have previously been reported. In those cases, both rumors are true.
In other news, Bryan Cranston is playing Lex Luthor, Emily Blunt is Wonder Woman, Benedict Cumberbatch is Martian Manhunter, and that guy from Teen Wolf is Batman.