Lets see..
1. It's from the creator of Super Smash and Kirby
2. It's a core game
3. Iwata asked for it
4. It's nothing like we've ever played before
Whatever it is.. It better be epic or there'll be a lot of disappointed people because that's some pretty big hype if you ask me.
Edit: Yeah he left Nintendo to form his own company which was titled 'Sora'. Then he was asked to come back to direct SSB: Brawl and I guess Nintendo offered him a deal where he now has greater power and greater funding so he decided to return and bring his development team to become a first party Nintendo team. Pretty exciting!