Updated my prediction list based on General Shi Gai's Info, however I did not change Lucina's or Jigglypuff's Status on it. Lucina because I don't get why people where mistaking her for a Marth Skin, and Jigglypuff because there is no evidence to her inclusion what-so-ever as of right now besides the single "Original Vetran Auto-Get In".
As of 7/14/14
Smash Bros 4 Characters Revealed:
1. Mario (Final Smash: Mario Finale)
2. Link (Final Smash: Triforce Slash)
3. Pikachu (Final Smash: Volt Tackle)
4. Kirby (Final Smash: Ultra Sword)
5. Donkey Kong (Final Smash: Konga Beat)
6. Samus (Final Smash: Zero Laser)
7. Fox (Final Smash: Landmaster)
8. Yoshi (Final Smash: Super Dragon)
9. Luigi (Final Smash: Poltergust 5000)
10. Captain Falcon (Final Smash: Blue Falcon)
11. Peach
12. Bowser (Final Smash: Giga Bowser)
13. Zelda (Final Smash: Light Arrow)
14. Sheik (Final Smash: Light Arrow)
15. Marth (Final Smash: Critical Hit)
16. Mr. Game & Watch (No Profile Yet)
17. Charizard (Final Smash: Mega Charizard X)
18. King Dedede
19. Diddy Kong
20. Zero Suit Samus (Final Smash: Gunship)
21. Ike
22. Pit (Final Smash: The 3 Sacred Treasures)
-Dark Pit as an alternate costume. Voice Pack Included.
23. Olimar (Final Smash: End of Day)
24. Toon Link (Final Smash: Triforce Slash)
25. Lucario (Final Smash: Mega Lucario)
26. Sonic (Final Smash: Super Sonic)
27. Villager (Final Smash: Dream Home)
-One alternate male version and two alternate female versions.
28. Wii Fit Trainer (Final Smash: Wii Fit)
-Male Wii Fit Trainer as Alternate Costume
29. Mega Man (Final Smash: All Star Finale)
30. Rosalina (Final Smash: Power Star)
31. Little Mac (Final Smash: Giga Mac)
32. Greninja (Final Smash: Night Slash)
33. Mii (Gunner Final Smash: Triple Laser)
-Three Variations each customizable in 32 different ways.
34. Palutena (Final Smash: Black Hole and Ultra Laser)
35. Pac Man (Final Smash: 8 Bit Pacman)
36. Lucina
37. Robin (Final Smash: Unison Attack with Chrom)
-Female Variation included
Characters confirmed via Whiteboard:
38. Meta Knight (Also note that the Halberd is a returning stage)
39. Wario (Also note that Waluigi and Ashley are both marked as Wario Characters)
Characters confirmed via Series Inclusion:
40. Ness or Lucas (Mr. Saturn and Franklin Badge items)
(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. Ice Climbers (Polar Bear in Smash Run)
42. A rep from Rhythm Heaven. Likely Marshal. (Series representation in Smash Run.)
Speculation and Low Priority Returning Characters:
43. A Xeno character, likely Shulk (Baseless Speculation besides Xenoblade’s popularity. There is a Rumor that there is a Mechon Trophy from Xenoblade in the game, but there is no proof)
44. 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?)
45. Isaac from Golden Sun (This is a stretch as he was simply not shown off during the assist trophy demonstration.)
46. 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 Adventure Mode final boss if Sakurai gets cheeky. The only remaining villain who makes sense is the Black Knight from Fire Emblem, though Fire Emblem may have just used up it's rep-space)
47. 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.)
48. 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!)
49. A Splatoon Rep?
50. Jigglypuff (Was low priority in Brawl)
51. 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!)
52. Wolf (Was low priority in Brawl)(NOTE: May become a Skin of Starfox!)(NOTE, May Hold Priority Over Falco Due To Villain Status!)
53. ROB (Has yet to be mentioned at all)
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)
- 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.)