to answer your question, when reddit discussed the character drawing that mercer posted of her, the comments were saying that adams is supposedly working on something possibly involving both stephanie & damian. adams has confirmed it's not a batfam book. commentors were quick to assume based on available information it was more than likely related to adams' desire for a young hero supersons based team & since so far the other characters who have been released have been in line with the supersons based young hero team he teased in the flash, into it's looking like that's more than likely that's the direction he's heading. nothing about damian or jon has actually been confirmed yet.
Thanks. Between that and what @alvindraperzzz linked I think I've got the picture now.
I do hate when people jump to conclusions like that though. Like, my two cents is, given what little they've shown so far, nobody should get their hopes up -- it looks like they're still in the conception stage, maybe even the pitch, in which case there's no guarantee the book will be picked up. Granted, Adams killed with One-Minute War so Thunderheart and Surge being involved seems to lend credibility to it, but you still never know.
All I can say is... If this team does come to fruition, it better damn well have its own name. Call it Adventures in Babysitting for all I care, but if they try to give Young Justice to Damian and Steph like that shitty Brian Q. Miller proposal that thankfully never happened, I'm going to lose it.
