If I wanted to be overly analytical, I'd point out two things with this image:
One, the shadows underneath toon link don't quite match up. The shadow of the top right screen is further to the right than it is on the bottom left screen.
Secondly, and this one really stands out more than anything, but shouldn't there be a (2P ->) symbol on the right side of the bottom left screen? Usually in smash if something is just off screen there is something to show this. Either a simply icon marker with an arrow, or in some cases a full circle with a fully animated small model of the character that is just off screen.
Also parts of Ness (Like his backpack) should be on the screen.
The models are the only thing giving me any real pause.
Regardless, I have been waiting for the 4chan leaks. You know it's nearly E3 time when they emerge.
They only thing? What about the Japanese version of the game calling him Bowser Jr instead of Koopa Jr?