I don't know what the winner will get or if there's anything to win at all. If there is I would assume it to be some cool Smash Bros merchandise like a GameCube controller or some kind of T-Shirt.Speaking of that what exactly DO you get if you win for real? What you said though would be pretty cool .
Honestly I believe the tournament is a publicity stunt by Nintendo to get the competitive Smash Bros players interested in making this game competitive and really that's a win-win situation for everyone.
I'm sure a lot of Melee players are starting to get sick of seeing the same things over and over again for the past 13 to 14 years.
Some new mechanics and playstyles likely seems very appealing and Nintendo seems to actually want to cater to the competitve players while also keeping the more casual players around and completley satisfied.
Hence the GameCube adapter, several balances with the characters, removal of randomness with movesets. (ie. Olimar and King Dedede), Final Destination for nearly every stage, and For Glory mode.
Personally I'm extremely excited to see how this all plays out at E3 and what kind of information we're going to get.