My DVR missed the series recording for some reason. Checked next week and it says episode 13 airs next week and I see Adult Swim On Demand has 8-12 available for viewing. Crazy.
EDIT: Whoops, never mind, think I'm getting my wires crossed with Korra or something. I was thinking Batman had 13 eps total but that's not the case.
EDIT2: Good news is that the episode is On Demand.