EDIT: See stuff that I just found here.
The Share menu (Sharing Mii Fighters, Snapshots and Video) is present in the Wii U version. The text for it is the same (AFAIK). There are no additional fighter characters. However…
Lastly… C:\SSB4\ui\replace\chr\stock_90 stock_90_Virus_01.nut
This strongly suggests that Dr. Mario was going to receive a stage. Perhaps the three different Viruses had a different effect on the players (Chill could freeze, Weird could give the effect of Lip’s Stick and Fever could give players fire breath). There’s no way to tell as the models and stage have been removed.
(Not in game picture)
ui_mark_db has references to rhythm (in the fighter section) and diary (in the stage selection). This is the game’s database for the emblems (marks) used in the game. See the original order below (text edited to delete extra markup). One theory is that the Gematsu Leak was correct, and the Chorus Men were originally planned. Diary is a potential reference to Swap Note, as the Japanese name is for the series is いつの間に交換日記 with 日記 being diary. One proposed theory is that PictoChat 2 originally was going to be a Swap Note themed stage, but was changed after the controversy. However, nothing else in the files suggests that so far, and the actual textures for the emblems are missing. The emblem order follows the character order. It’s sad to see that the Ice Climbers and Snake were removed.
Please note, it seems that the textures for these series have been removed. Stay tune for additional information.
smashbros donkeykong starfox kirby fzero metroid mother pokemon zelda mario yoshi
pikmin wario palutena famicomrobot sonic plankton touch doubutsu
wiifit xenoblade punchout duckhunt rhythm rockman
nintendogs miiplaza pacman tomodachi wreckingcrew
wuhuisland miiverse lightplane braintraining balloonfight diary etc
Personally, I feel this confirms the Gematsu leak. Most likely Chrom was pushed aside for Robin, early on in the development as Sakurai felt that Robin was a more unique character (And then Sakurai lampooned Chrom for even being considered in the Robin reveal trailer and Palutena’s Guidance).
Before I forget, there’s a ton of people to thank and recognize. The Wii U hacking has made significant progress in the last two weeks. crediar released his decryption software, chroxx and RandomTalkingBush made the code to properly extract the files for Smash 4 Wii U. Without their efforts, I would be very lost.