Stumbled upon this while searching Google for material for a different thread.
Suspect it is building up to a storyline reveal if it has not already.
The only thing I can think of comparable to it at the moment is Marvel Comics during their "Guess the Identity!" of Green Goblin and Hobgoblin years back.
Yeah, that hasn't been a mystery in quite a while--the woman in all those #1 issues is 'Pandora'. Not only did she have an entire event based, in part, around her(ie. Trinity War), but she also has a self-titled on-going series that is currently 14 issues deep.
I'm either out of the loop or DC teased that even better than I thought they did.
Did they somehow include appearances like those shown in the article I linked to when they explained what you just told me, or was this a fun "seek and find" exercise that people KNEW to look for before the full storyline reveal you're suggesting?
Until you showed me that article, I never realized comic companies engaged in anything that famously subliminal. Subliminal yes, but not so blatantly and classically so.
I'm not sure what you pointed out is isolated, either.
I found this one myself just a little after reading your post.
This is Superman/Batman #8, where someone's VERY famous cousin was re-introduced in 2004 by Jeph Loeb and Michael Turner: