Yeah, in one of the daily updates at SmashBros.com they announced what controller will be used in Super Smash Brothers Brawl. I personally thought either Gamecube Controller or a sideways Wii Remote. Well, my prediction was right, sorta.
Super Smash Brothers Brawl will use every possible control layout during play.
It uses the Classic Style Wii Remote, Wii Classic Controller, Wii Remote + Nunchuck, and the Gamecube Controller. And while, Nintendo said Gamecube controller would be the easiest to know, they also said using the 3 other control options would provide a much fresher feeling to the game.
So, despite the console is no longer being shipped, my guess is that Nintendo Gamecube controllers will still be around for quite some time to come. However, no control scheme has yet been announced, though we can assume that the Gamecube control scheme is almost identical to Super Smash Brothers Melee. They did also say, that the control scheme would be posted on the site, in due time. But they did miss one control layout. Couldn't the Nintendo DS act as a controller? :P