Just going to put this here:
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If you look at the places I've marked, we have both confirmed and partially confirmed information.
Shulk was confirmed a bit ago, this leak is older than that.
Bowser Jr is confirmed through video evidence, professionally crafted screenshots, and Nintendo damage-controlling the leaks. Duck Hunt Dog, Dr. Mario, and Dark Pit are shown through screenshots, and most of the screenshots shown off are identical to picture-of-the-day posts done by Sakurai. And they were submitted before official publishing of his miiverse/smash bros site posts.
There are question marks around the markings of Doc and Pittoo because their details haven't been confirmed yet, but their prescense is already proven.
The 8 palette swaps were confirmed today.
Shulk's trailer indicates the exact same properties that the leak is affirming about his stage and "Monado Modes". It even states that he has 5 modes, which are shown off in the trailer.
Bowser Jr is shown through video that he fights in his Koopa Clown Car, with boxing gloves and cannonballs.
Duck Hunt Dog is proven to be within the roster, and a duck appears next to his character portrait, but further details are not confirmed yet.
And the rest is speculated to be true or not.
But you have to admit, that all of these assertions are quite accurate, especially about a lot of details that weren't shown off prior to the big leak in the first place. Because of that, you might as well call it natural that a lot of people will assume the rest to be true.
That's all I'm going to say. Carry on hyping about the Dark Samus palette, guys. I know I will.