I haven't heard anything about six seasons but I do know they were greenlit a few months ago and start work on season 4 which is supposed to be 20 full episodes! I wouldn't be surprised if it lasted that long though because I'm thinking this is probably the most popular cartoon Adult Swim has ever had except for maybe Aqua Teen.
But seriously though, how fucking crazy would it have been to have been in that Courtroom during the real hearing?