Hey, well i dont know if this is old, well its probably is, but just in case, theres probably going to be a boss mode once you beat Subspace Emissary. How do you know this you may ask?? Well i work for the people who make.... lol joking joking, but i know this because on the Brawl site, when you go to trophy stands spot, "I’ll make it so you’ll somehow be allowed to fight the bosses even after you’ve already cleared the game, so it’s OK if you don’t hunt all these trophies down in the first battle."