The Star Fox series, F-Zero Series, Metroid Series, and Earthbound series are- in my opinion- some of the most unrepresented series in the past games.
Do you think they'll change that in Brawl? What would be a likely newcomer candidate for theme?
Games like Ice-Climbers couldn't have any more characters. What if they went along with the retro-theme the Ice-Climbers have? Like adding Balloon Fighter and whatnot. Just a thought.