yeah, it would be weird if they ignored the already established stories/relationships. It would also contradict previously released merchandise.
but the way they worded "Batgirl finding out her best friend Harley is a Gotham villain" gave me the impression that they are meeting for the first time - not to mention the stuff about secret identities and stuff.
It almost sounds like a reboot with a new focus - dealing with the "normal" teen/hs life of the girls plus the superhero stuff.
In the current web vid stories, there really is no distinction between normal life and superhero life - they all go to superhero academy and know each other's identities and code names.
Plus, both girls and guys go to the school. But again, the way they word the new description, it sounds like the guys or "bros" belong to the Justice League?? So the girls go to an all girls-school while the guys go to a different school? what??!!