Funny, I'm starting to disbelieve it more and more as time passes, despite being initially blown away when looking at it. Here's one of the reasons why.
To make this post not a complete case of being Greninja'd. . .
--He says the Ice Climbers are planned DLC. Because they're totally just going to become DLC mere months after release after being left out due to Sakurai's alleged inability to put them in after nearly three years of game development.
--This is all in English. When Brawl leaked, it was all in Japanese.
--It's all menus save that one screenshot of Shulk punching (exactly like Ike) on the Brawl Yoshi's Island. Brawl leaked with screenshots from literally everywhere (a lot of new stages, Subspace Emissary, menus, Classic intro screenshots, even the Trophy Gallery).