Updated my prediction list. Axed anything that wasn't Nintendo from it.
Smash Bros 4 Characters Revealed:
1. Mario
2. Link (Final Smash: Triforce Slash)
3. Pikachu (Final Smash: Volt Tackle)
4. Kirby (Final Smash: Ultra Sword)
5. Donkey Kong
6. Samus (Final Smash: Zero Laser)
7. Fox (Final Smash: Landmaster)
8. Yoshi (Final Smash: Super Dragon)
9. Luigi (Final Smash: Poltergust 5000)
10. Peach
11. Bowser
12. Zelda
13. Sheik
14. Marth (Final Smash: Critical Hit)
15. Charizard (Final Smash: Mega Charizard X)
16. King Dedede
17. Diddy Kong
18. Zero Suit Samus (Final Smash: Ship Summon)
19. Ike
20. Pit (Final Smash: The 3 Sacred Treasures)
o Dark Pit as an alternate costume. Voice Pack Included.
21. Olimar (Final Smash: End of Day)
22. Toon Link
23. Lucario (Final Smash: Mega Lucario)
24. Sonic
25. Villager (Final Smash: Dream Home)
o One alternate male version and two alternate female versions.
26. Wii Fit Trainer (Final Smash: Wii Fit)
o Male Wii Fit Trainer as Alternate Costume
27. Mega Man (Final Smash: All Star Finale)
28. Rosalina (Final Smash: Power Star)
29. Little Mac (Final Smash: Giga Mac)
30. Greninja (Final Smash: Shadow Claw?)
31. Mii
o Three Variations each customizable in 32 different ways.
32. Palutena (Final Smash: Black Hole and Ultra Laser)
33. Pac Man
Characters confirmed but don’t have a profile yet:
34. Mr. Game & Watch (Whiteboard AND Pac Man Reveal)
Characters confirmed via Whiteboard:
35. Meta Knight (Also note that the Halberd is a returning stage)
36. Wario (Also note that Waluigi and Ashley are both marked as Wario Characters)
(Note, any fighters above this number will go against Sakurai’s statement that there will be no more playable characters than there where previously)
Characters confirmed via Series Inclusion:
37. Captain Falcon (Samurai Goroh Assist Trophy)
38. Ness or Lucas (Mr. Saturn and Franklin Badge items)
39. Ice Climbers (Polar Bear in Smash Run)
40. A Fire Emblem Awakening Rep (Arena Ferox. Will likely involve Robin or Chrom. However, note that Chrom and Gaius both won the first popularity poll for what characters Japanese gamers want to see in the new Smash Brothers. Note the Gematsu Leak notes Chrom as the 3rd fire emblem representative. Note that Robin will be the best next option if Sakurai does not wish to have a Marth/Ike Mix Clone. Also note that Robin would allow another female into the cast as well as the current 10.)
(Note: Any fighters above this number will go against Sakurai’s statement that there will be no more playable characters than there where previously TECHNICALLY)
41. A rep from Rhythm Heaven. Likely Marshal. (Gematsu Leak and series representation in Smash Run.)
Speculation and Low Priority Returning Characters:
42. A Xeno character, likely Shulk (Gematsu Leak)
43. The fully evolved form of a Grass Type Starter Pokémon (Speculation. It would complete the Pokémon Elemental Triangle. And because Pokémon Gen 3 is getting a Remake. Sceptile?)
44. Isaac from Golden Sun (This is a stretch as he was simply not shown off during the assist trophy demonstration. But he can be potentially promoted.)
45. A villain from an already established series in the game. (King K Rool and or Hades. Note that Ridley has been confirmed as a Stage Boss, but keep in mind Sakurai’s tendency to play with expectations. Also note that Hades has the potential of being the Story Mode final boss if Sakurai gets cheeky. The only remaining villain who makes sense is the Black Knight from Fire Emblem.)
46. An updated Gannondorf (Recall how Sakurai stated that when updating Yoshi, he wanted to keep it under wraps as not to cause too much of a disturbance. This may be the same case.)
47. Lucas or Ness depending on which one isn’t added first (they are clones of one another)(NOTE: One may become an alternate skin of another!)
48. Jigglypuff (Was low priority in Brawl)
49. Falco (Clone Character)(Note: it’s been suggested that Falco or Wolf take over Snake’s Moveset if Snake does not reappear.)(NOTE: May become a Skin of Starfox!)
50. Wolf (Was low priority in Brawl)(NOTE: May be prioritized over Falco in order to have another villain in the game!)(NOTE: May become a Skin of Starfox!)
51. ROB (Has yet to be mentioned at all, though Miyamoto still shows interest in him)
Characters likely not returning:
• Dr. Mario (Note that Dr. Mario did have code pertaining to him in Brawl, however was cut due to time constraints)(NOTE: This may appear as an alternate skin for Mario!)
• Young Link (Forever replaced by Toon Link)
• Pichu (Note that Pulse and Minim where set to replace Pichu, however was cut due to time constraints)
• Mewtwo (Note that Mewtwo did have code pertaining to him in Brawl, however was cut either due to Time Constraints or his similarity to Lucario)
• Roy (Note that Roy did have code pertaining to him in Brawl, and could actually be added to the opening cutscene via a cheat device. He was likely cut due to time constraits)
• Squirtle (Because Charizard was separated from the Pokemon Trainer, and Greninja took the spot of a Water Type Pokemon in the game, Squirtle will likely be demoted back to a Pokeball or cut all together)
• Ivysaur (Because Charizard was separated from the Pokemon Trainer, Ivysaur is an odd one out amongst the Pokemon not being in his fully evolved form. If he returns, it will be as a Venasaur. However, the counter speculation that Septile might be in the game to accommodate a middle generation representation makes Ivysaur irrelevant.)
• Solid Snake (Kojima had stated he was not aware of Solid Snake being back in the game, and invited Sakurai to add him in again despite not wanting to bring Ground Zeros/The Phantom Pain to the Wii U. However its likely too late to add snake back in and the previously mentioned not bringing Metal Gear to the Wii U makes Snake’s chances almost dead.)