As in, subvering the genre conventions of the Mario and Legend of Zelda series or something. He decided not to, but it sure could have shook up the two series:
http://www.eurogamer.net/articles/2010-12-13-miyamoto-hoped-to-destroy-nintendos-past
http://www.eurogamer.net/articles/2010-12-13-miyamoto-hoped-to-destroy-nintendos-past