Release Date: Many seem to believe that this leak was one of the first mentions of the November 21st international release for the Wii U version. While this is technically true, on the surface it does not appear to be THE first. The twitter leak that initially suggested a November 21st release date actually came out earlier on the same day (1:38 pm) as the first 4chan post (15:12/3:12 pm):
https://twitter.com/emi1yrogers/status/510890251985100800
It’s certainly plausible that if the leak is fake, the leaker could have copied the date from this tweet, but given that there was only about an hour and a half between the two, it could really go either way.
BUT...
The timestamp for the 4chan post is in military time. After checking 4chan to confirm that it defaults to the 12 hour clock in America, this led me to believe that the screencap of the 4chan post originated from somewhere in Europe, presumably the UK, given that’s more or less the only European country with a big presence on 4chan. Using a handy dandy time zone converter, I found out that 15:12 in London is about 10:12 am EST (my time zone).
However, twitter timestamps seem to be based on the time zone where the tweet originated from (I changed my clock just to make sure), and Fred Meyer, the store from which the preorder card in the tweet originates, is a chain based almost entirely in the American Norhwest, meaning the 1:38 pm in the tweet is most likely PDT. 15:12 London time is 7:12 am PDT, which means, if my calculations are accurate, then the 4chan post was actually posted 6 hours and 26 minutes BEFORE the tweet, making it the first mention of November 21st after all! DUH DUH DUHHHHH!
If Twitter bases time stamps on IP address instead of internal clock, which it might, then the leak is still nonetheless 3 hours and 26 minutes older than the tweet.
This is definitely strong evidence in the leak’s favor, but bear in mind:
1. There has been no official confirmation from Nintendo yet of a November 21st international release.
And
2. November 21st is a pretty safe guess all around, considering it’s a week before Black Friday and has traditionally been a big day for Nintendo Holiday releases.
Nature of Wii U/3DS connectivity: The leak says that custom characters and unlocked moves/equipment can be shared between consoles, and the description for the “Wii U” menu option on the 3DS confirms this. However, we already knew this. The leaker also clarifies that trophies cannot be shared between games, which makes sense given that the two versions have different sets of trophies. The only truly new information the leaker gives on connectivity is that it will unlock five new characters on 3DS, which is as of now completely unconfirmed by any official source.
Castle Siege: Announced a day (9/19) before the stage list was posted on 4chan (9/20):
https://miiverse.nintendo.net/posts/AYMHAAACAABnUYoL6LijOQ
Game & Wario Stage: The first stage actually predicted by the Tower of Smash leak. Although as many have suggested, it’s a pretty safe guess given that Game & Wario is the most recent console Wario title, especially considering the name doesn’t match. Many have also speculated that “Gamer” may only be one of several scenarios in the stage based on Game & Wario games, similar to the Warioware stage. I personally find this unlikely, but it’s another plausible explanation for the name discrepancy.
Great Fox Stage: We got a tease of the stage months ago, so the leak didn’t really predict this at all.
Onett & Smashville: On 10/3, these two stages were revealed in the pictures on Ness and Wario's character pages, making them the second and third confirmed stages to be predicted by the leak. Onett was a pretty safe guess given that it's such a classic and beloved stage that represents its series well. However, many people thought that Smashville was too redundant to return, making its confirmation mean a lot more as far as confirming the leak.