Ah. I'm talking about the bubble gum popping Robin "Oracle" type character who showed up in the finale.
I would be okay with cameos, though I think they're pretty cool, and deserve to be more. I have to admit that I just don't care about Gotham Academy anymore - it was a hard sell in the first place, and this new series lost me hard. But I love Riko and co, so if they showed up, I would totally read that.
What trial? Did I miss something?
I don't think they were completely throwaways - Brian Buccellato used them in the Detective Comics Endgame one shot, and Bermejo did at least one issue focusing on each of them.