I was very happy to see them show up in Young Justice.
Cass at least has the Outsiders and the movie ( I still can't believe the full title of that movie is Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn)
Steph on the other hand just has a YJ guest so far announced in the comics.
Well we hope. Cass isn't the star of the BOP movie. WW had a record breaking solo movie didn't stop Tom King using her as a lamp in his BatCat shipping. Literally bring her in to be rejected.
DC has done nothing to promote her other than what they've always done. One could argue that they are doing less since WW used to have 2 titles but now she just has one.
This Batman 80 would have been excellent PR and promotion for Cass,a character that's about to hit the big screen. Hopefully Cass is a breakout character bringing in so much merchandise money DC has no choice but to promote her.