I'm saving my opinions on the movie after seeing more. I don't think introducing their characters in what's going to be a popular movie showcasing B/S for the first time together on screen is a bad move. As far as what's to be the JL film, supposedly Brainiac will be their first obstacle with a GL coming in mid film or the end to help and/or warn of a bigger threat to come... Darkseid. 

~KL~