Thank you Masahiro Sakurai, the creator of Super Smash Bros., for giving us all an insight of what the controls of Brawl will be like.
On the Super Smash Bros. Brawl website, Masahiro Sakurai has posted a picture of how the controls for Brawl will be like. Here it is:

With these controls, it seems that Brawl will need some time to get used to. However, it should not discourage players from playing the game as the experience may change over time. Also, players can also use the Gamecube controller as well as the classic and nunchuk controllers! So don't fear, Brawl is going to be a blast!