Nintendo held a Wii Q&A session this morning (Wednesday Night in LA), and Shigeru Miyamoto let loose that Super Mario Galaxy may not be ready for the Wii's launch.
Miyamoto said "Mario is progressing along quite well, but it's often said that when I get involved in a project I upend the tea table. I don't want to promise anything yet. But if it's not a launch title it will definitely be there within the first six months."
So there we have it, Nintendo could be in the position of having Neither Mario nor Smash Bros ready for the launch of their new console. While in the past this may have been a disaster, this time the launch is still looking huge, and blockbuster games like Ubisoft's Red Steel and Nintendo's The Legend of Zelda: Twilight Princess will probably be able to hold the fort until Mario's arrival better then Luigi's Mansion and Pikmin tried to do last gen. There's a demo of Super Mario Galaxy on the show floor, we'll get you more info on the game soon!