Well, despite the rumors circulating (this site in particular), it looks like Young Justice is not coming back, and that the hints by Warner Archive were for the release of Season 1 on Blu-Ray.
Via Warner Archive's Twitter, here is a picture of YJ producer Greg Weisman holding what appears to be an advertisement to the "Young" hint that was alluded to a few weeks back.
There you have it, folks. Let's use this as a good lesson in not jumping to conclusions.