Dead:
Journalist Leak - Comprised of a "final roster" without Rosalina or Toon Link.
Reddit Leak - Claims that Rosalina is an Assist Trophy.
ThatWasPeachy False Leak - Self-explanatory.
Wegenbarth False Leak - See above.
APC99 False Leak - See above.
Occopicus Leak - Fortanono fake.
60 Character Roster Leak - Someone in this thread (don't remember) confessed to making it.
splat False Leak - Self-explanatory.
MisterVideoGaming False Leak - See above.
Competitive Arsehole Friend Leak - Clever analysis by Groose indicates that numbers-based poster username spells out "'Tis Fake!"
Early February 2013 Crap Leak - Claims that "Mega Man is off the table."
Smashboardian Leak That I Think Fortanono Made Leak - I was correct.
legendofrob1 False Leak - Self-explanatory.
Illiterate Leak (#2) - Said that Captain Falcon would be revealed on January 21st.
Toots Leak - Leaker admitted it was fake
Character Model Leak - Some models were incorrect (I think)
Mr. Prediction Leak - Said that Shulk would be revealed on January 30th.
Hanafuda Leak - Said Lucario was cut.
Basty Leak - Also said that Lucario was cut.
Sandbag Leak - Said that Sandbag would be revealed on January 31st.
Really Short Leak - Lucario was revealed before Captain Falcon.
Frostwraith Leak - Self-explanatory.
Sakura Leak - Says that "Smash 5" is already in development by a different studio, when Sakurai has stated that SSBU and SSB3DS are Smash 4 and 5.
Sesquin Leak - Stated that Spear Pillar would return, but Palkia (major stage element of Spear Pillar) has been confirmed as a pokeball Pokemon.
Live:
Jumpman Leak
[COLLAPSE="Killable By:"]
- Exclusion of Mewtwo, Dixie, Mii, Jumpman, ROB or Lucario
- Inclusion of Snake
- Roster exceeding "around 40 characters"
- Exclusion of Bowser Jr. Assist Trophy
- Exclusion of Cannon Box item