This is taken straight from the above site.
Two new clips, from the upcoming Young Justice episode "Targets," were released this past weekend during San Diego Comic-Con 2011.
Cartoon Network and Warner Bros. Animation released two clips from the upcoming Young Justice episode "Targets" during the weekend San Diego Comic-Con 2011 event. The clips were released to promote the slate of upcoming new episodes of Young Justice set to hit Cartoon Network Fall 2011.
This pretty much confirms no new episodes for August.