Basically, the best way that I can explain this is to just call it Titans, because it's really interesting to me that they are basically taking the concept for Teen Titans and modernizing it, which is still awesome, don't get me wrong, I'm really looking forward to this!
(I thought J'onn was the last Martian)
From The Source Blog: YOUNG JUSTICE is an all-new series produced by Warner Bros. Animation and based upon the characters from DC Comics. In YOUNG JUSTICE, being a teenager means proving yourself over and over – to peers, parents, teachers, mentors and, ultimately, to yourself. But what if you’re not just a normal teenager? What if you’re a teenage super hero? How much harder will it be to prove yourself in a world of super powers, super villains and super secrets? Are you ready to come of age in such a world? Are you ready for life or death rites of passage? Are you ready to join the ranks of the great heroes and prove you’re worthy of the Justice League? The members of Young Justice—Robin, Aqualad, Kid Flash, Superboy, Miss Martian and Artemis—are about to find out.
It just seems like Robin got tired of that two-bit Teen Titans and started a new team. I don't know, it's cool, I'm sure it's going to be great, but I still want JL and JLU to come back, maybe that's just me..
Source: The Source