I have my thoughts on the leak right now.
I might have been more inclined to believe this if Waluigi and Takamaru weren't listed here.
Not because they'd be bad characters or anything, in fact I'd love Waluigi.
The OCD in me wants the 4th plumber, and more characters for team battles are always a good thing IMO.
However, Waluigi and Takamaru are already ATs...and that by itself possibly de-confirms the leak(unless it is possible to simply set their ATs off when they're in battle? That's possible if this happens...)
I'd like to ask for some elaboration about what exactly this list (which from what I understand encompasses, among others: Wolf, Agent 3 (Inkling), Waluigi, K. Rool, Paper Mario, Chibi-Robo, and Takamaru?) entails.
Honestly, if Inkling is announced with the name "Agent 3," then I will fully believe that he had a source.
The name is a very "Sakurai" name, akin to Mr. Game & Watch, Toon Link, Duck Hunt, Wii Fit Trainer, and Villager (Toon Link was always referred to as Cel-shaded Link or Cel Link before being leaked for Brawl, while Villager was called Animal Crosser by fans before the Smash 4 reveal trailer).
Is this "leak" the list that Nintendo is giving Namco of particularly popular characters to consider?
Or is this a list Sakurai made of characters he already know are popular (he already noted the popularity of K. Rool during Brawl) but wants numbers to back them up before creating them?
Even if this leak is real, it doesn't really tell us anything other than that a few newcomers, veterans & Assist Trophies are being put into consideration.
That's what I see.
In conclusion, I'm just going to let the leak play out and see what happens. I don't want to get hyped a lot.