It might be possible we're getting Smash 4 earlier then we expect. There's this German article here with the possible news, in an interview from a German General Manager that works for Nintendo. And I don't know how many users here known German (Besides Edo, who I believe lives in Germany). But the most important part has been translated already and confirmed to be a reliable translation.
In German: Für nächstes Frühjahr sind außerdem mit Mario Kart 8 und Super Smash Bros. zwei weitere große Lizenzspiele für unsere TV-Konsole angekündigt.
Translation: For next spring two more big license games are also announced for our TV console with Mario Kart 8 and Super Smash Bros.
It seems odd they'd release both big games relatively this soon next to eachother. But dang, Smash 4 in Spring? That sounds almost too good and/or soon to be true. You would think they'd at least save Smash 4 for sometime after E3 so they can show off a big trailer to hype up the game. Only time will tell though if this is true. But a rumor coming out of the mouth of an employee is more plausible then a guess from 4Chan, GameFAQs, or anyone who says they have a friend or relative that works for Nintendo and knows something about it.
In the rest of the interview he just talks about how the Wii U isn't selling as bad as everyone says and how Nintendo has no intentions to develop Smartphone games atm.