The cosmic boy is a new DC Comics Superheroes Mini-figure that was already known for a while but at the time there were a few doubts about if it was going to be its final presentation, for instance a set’s figure or only Encyclopedia member.
Well, the answer is here, thanks to Brickset! It will be a polybag with around ten pieces that shows the Cosmic Boy with a black suite in a small flying saucer, with lots of nice printed details and two disks in its hands. There is also a Legion super heroes Logo in the bag which might indicate that we might see a few more of these in the near future.
There is no word about it possible availability but it will probably be part of an upcoming promotion at shop@home.