Upon seeing this, I am slightly relieved. I honestly can't imagine them completely replacing Young Justice in favor of this, especially when they have a YJ video game coming out in 2013. Like I said earlier, they will probably spread the shows out and have them showing at different times of the year.
that's what i'm thinking as well, since they also have Beware The Batman set to start later this year... It would make sense that they wouldn't wanna just show repeats of the same shows, and have something new. This could take the spot of YJ when the season is up, and then when this show's season is up YJ could come back.