User blog comment:Rassilon of Old/6 new Young Justice: Legacy characters revealed/@comment-128.36.206.208-20120501003850/@comment-128.36.206.10-20120506233547

Update now that 23/24 are announced:

Well, I got Bane right. Klarion's also there, so he's getting a lot of video game love. Unknown villain's probably someone we haven't met yet in Season 2.

Rocket is in, but no Blue Beetle or Wondergirl. Instead, we get more Bat-characters, with Dick updated to Robin and Tim and Babs also playable. M'gan and Conner have had their headshots updated too, so it looks like it will be set closer to Season 2 than Season 1 in the time gap.