Well, you're not *entirely* wrong. There is an Ivy the Kiwi? game that was released on DSiWare. (appropriately named Ivy the Kiwi? mini) It is primarily the same as the retail DS release, but only features 50 stages as opposed to the retail's 100 stages. Which I feel still gives you a lot of gameplay, especially considering the downloadable version is a mere $5.
But yeah, this new game looks to be on an entirely different scale.
I don't trust anyone/thing associated with Sega... though according to Wiki he produced both Nights into Dreams and Phantasy Star Online, neither of which I have played however both are held in high regard. So maybe it's a good game after all!
Yuji Naka did not create Sonic. Sonic was created by Naoto Oshima(original character designer) and the gameplay and levels of the originals were designed/directed by Hirokazu Yasuhara. Naka just did the programming.
Naka did create NiGHTS and Phantasy Star Online however.
Anyway, even if this game is Sin & Punishment-ish, that's good in my book. S&P rocks, I'm interested. The wii-mote only thing intrigues me.