One of the more disappointing moments in Batman v Superman sees Bruce stop for a brief moment to observe Robin's defaced suit...and then move on without another word. If you've seen the trailer you've seen everything that the movie gives us in regard to Bats' fallen sidekick, when fans were clearly expecting some sort of deeper explanation of what The Joker did to Robin and how it has affected Bruce psychologically (this could even have explained his killing a little easier). Some have taken this to suggest that we may be hearing more about Robin's demise in both Suicide Squad and Justice League: we as fans deserve to know rather than leave this hanging for no reason at all. Plus, as Bruce joins a team of heroes in Justice League, he'll no doubt meditate on the fact that his last teammate, Robin, ended up dead.