It's just a thought at the moment, but after having played through the entire Batman: Arkham City game; could there be a connection between the ending of Batman: Arkham City and the recent shooting? They both end in a movie theater and the shooting did take place at a Batman movie showing. I do wonder whether or not the shooter had ever played Batman: Arkham City.
Picture #1: http://nonstopkarate.files.wordpress...ng?w=604&h=332
Picture #2: http://1.bp.blogspot.com/-qI1EHuogcl...ty+shot+09.jpg