Don't think this has been posted yet, but here's what Cartoon Network had to say on Twitter today:
Love the responses in there!
So, it looks like hiatus until January; no official reason given. Some have speculated that this has happened because of the unexpected ratings dominance of Nick's new TMNT show. Basically, Cartoon Network is falling back to regroup before they burn all of their new content against something they can't beat right now.
I've heard no release dates, but could it be they're going to expand DC Nation to a 2 hour block with the new Batman show in January? Pure speculation on my part. Unfortunately, Cartoon Network has a bad history with their shows (as we've discussed in this thread), but I hope that they will at least finish airing what they have.