From what I've seen, everything that makes this leak credible also casts doubt. We're so quick to doubt it because it's a text leak from 4chan, but wasn't that how Melee's and Brawl's rosters were leaked, again as text. Even the 3DS CSS leak was originally the Nanka/Vanrose text leak until someone put up the pics. Also, people try to say that the detail hurts the leaks, since it could be the guy making things up, but then again detail may mean he knows what he's talking about - if he was faking, why would he put in weird details that make it easier to debunk?
I still don't know what to think about it. I really want it to be true, but there are a few things I think are weird about it. First, the wingless Ridley thing - wat. Second, if they were going to do cross-console connectivity unlocks, why 5? It would make more sense to only have one or maybe two, since the whole point of the 'both rosters are the same' is that people wouldn't have to buy both versions to get the characters they want. So we get 5 extra characters? I guess if it was something like 'the two versions have two exclusives each which you can transfer if you have both versions, but will be available for DLC after some time,' I'd but it more.
I have a feeling that the next stage revealed will not prove/disprove anything. If they hype us up by showing
returning, that's going to do nothing to help the leak. Yeah, they implicate it, but with
being a character now (and the FS he gets), we're obviously getting that stage back. Now if they pull some obscure stage out like Endless Ocean, then it helps, but assuming the leak is true, that stage is unlockable, so we're not getting that.