I agree full-heartedly that this is a fake. This game wouldn't even be HALF complete if the Ice Climbers weren't in the game.
The proof that this 'leak' is a fake is simple:
1: Duck Hunt Dog, one of the most HATED characters in video gaming.
2: Dr. Mario taking priority over the other (more important) cut Melee vets Mewtwo and Roy
is also dubious, and was deliberately chosen because of Sakurai's "If a character plays differently, I give them a slot on the roster" quote, just to try and make it more authentic.
3: It was posted on 4chan, the hell of the internet. It's disproved already.
4: In the supposed picture of Lucina and Shulk, I CAN SEE THAT LUCINA IS IN THE SAME POSE FROM THE ROBIN TRAILER.
5: The other picture 'depicting' 'Shulk' is just a hacked Snake.
How can I not forget Snake's 1-2-Kick jab? It was too obvious.
6: Wario's left pupil is missing, and Mr. Game & Watch is clipping into the character portrait.
7: Other people have noted this, but there are no Mii Fighters, and the names of each fighter are missing.
'Leaker', I hope you're happy, you nearly gave THE ENTIRE SMASH COMMUNITY A HEART ATTACK. >_<
Because of this, I'm wanting Shulk even less, and what I really want is for these poor little guys to be confirmed already!
We've seen the Polar Bear, and I think they're safe... for now...
Please be even faker, 'leak'. >_<