Willie:
Mario was supposed to be a launch game. They had the game running in demos at E3, so I think progress is moving along quite well. June would mean that Nintendo gave the game over a 6 month extention in development time.
So I think the game will be ready by June the latest July, but Nintendo usually has a June game available for summer.
Now, the game I expect to be out Christmas is Super Smash Brothers Brawl. That game is getting the entire year of 2007 to be polished and perfected. It will be the game that Nintendo pushes hard for online play.
I also believe that 2008 will be the year of the Wii...with huge franchises coming out from Nintendo to push sales through the roof.
2008 will be the year of
Mario Kart,
Zelda,
Pikmin,
Nintendogs,
True Pokemon RPG,
Mario Sports,
ect.
Oh, I final prediction 2007 Christmas big game along side Smash Brothers will be Wii Sports 2.
The franchise will go either one of two ways. All the original games back and polished with more depth, with an additional 3 Sports. Or 5-7 Brand new games.
I would love the game to keep its simple approach but add more depth.
Baseball have the game control the people again, but allow the player to select a base throw to and have limited field control in that regard.
Golf More courses and take an approach similar to Super Swing Golf. I like not having to select clubs though.
Tennis select two separate Miis for single player games, and perhaps expand the series with Tennis like games like Racketball.
Boxing: Needs a world of work...so anything would be better. I would like dodging to be done with the analog stick or a button.