Earlier this week, it wa revealed that the Cosmic Boy (30604) minifigure polybag would be available with the upcoming LEGO DC Comics Super Heroes – Justice League: Cosmic Clash movie. You can now pre-order the movie on Amazon. Both the Blu-Ray + DVD + Digital HD and and the regular DVD versions will include the Cosmic Boy Minifigure. The movie will be released on March 1st.
Thanks to Julio for emailing this in.