This is great news. I was more than certain that the show was getting axed, especially with the American Dad renewal. With a short order (no pun intended) of 13 episodes, I'd expect to see this come back next Spring, once they're run through the gamut of AD/Cleveland episodes early in the fall.
If you got turned off by the admittedly-awful first episode, give it another chance. You won't be sorry.
I loved this episode, the wife didn't as I kept having to explain who everyone was and why the green Lantern looked different. I did like Hawkman's line on how he is going to find all the remaining JSA's kids and such to take over.