Grant composing for Mario is enough to make me interested. (And I'm really curious how this collaboration came to be ... including Grant at least hints at a development environment open to interesting ideas.)
The Rabbids remains unappealing for me, and were it not for this project, I would've preferred to have forgot the IP completely.
Hmm ... if Nintendo's careful, controlled classic Mario balances out the Rabbids' slapsticky toilet humor maybe we will get something more in that tastefully unorthodox "Rareware" realm. In the end it all comes down to execution.
Grant hasn't denied this rumor, despite the twitter noise, and he's usually pretty interactive. If this is all true, the'll be a nice soundtrack to youtube at the very least!