Here's what IMDb has to say:

8 minutes were added to the 'Special Version' to bring the running time to 121 mins. Around 100 edits were made to the movie including consideringly amping up the sound during the violent scenes. Among the scenes added to the Special Version were: a flashback to a basketball match that Shuya and Mimura played in school; an extended speech given by Kitano to the students; after Mimura hacks the computer system, Kitano shuts down the power to the monitors and acts very ambivalent to it; an alternate 'requiem' ending.