User blog comment:Rassilon of Old/Silhouetted characters on the Young Justice: Invasion poster revealed!/@comment-76.97.13.51-20120512225000

I think the 3 mystery characters are Speedy(Roy), Static and Impulse(Bart).

The archer is clearly a boy, and due to being fozen Roy is still very young. The one next to Robin is wearing baggy clothes and really does look like Static(also, I can't think of who else it would be.. :/) The one on the far right honestly looks a lot like Impulse, so I'm really hoping it's Bart~ >w<

These are just my opinion, of course. I can only sit and hope I'm right. ^_^