There needs to be a "Classic Moments" mode for the downloading, including Adam West "Bam!" "Pow!" sound effects that pop up when you pull off a takedown, complete with trombone noises and stuff, the Stun-Baton thugs making that "Brrrblrrrblbrrrbl!" noise from Batman Forever for the rest of the round if you shock them, and when Batman picks a thug up, he says "I'm Batman" before he throws them.
I can totally seeing somebody making a mod for this by year's end.