I found this image from toonzone what caught the most attention was the poster on the right
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As far as I know there hasn't been any talk about a new Justice League cartoon from Comic Con. Also I'm wondering if anyone has seen a bigger picture of the poster so we can get a better look of the silhouettes.
Not sure if it's web exclusive or it's going to be on Cartoon Network but if it is gonna be on CN, don't expect it to be anything like Young Justice. I can see it being like the 2003 Teen Titans cartoon which had it balance of action and humor.
Edit: So the picture was taken at WB animation by animator Thomas Romain and he posted it on Twitter.