5-6 million, I don't think it will outsell TP.

It's obvious that Zelda Wii will be a much less involved gaming experience than OoT, Majoras mask or the older zeldas.. I suspect it will be even less involved than the highly casual twilight princess. This makes me think it will probably sell close to 8-10m. Since this game will have the "click a to solve puzzle" included, it attracts a lot more 5-8 year olds and will probably even break 12 million with frantic mothers buying the game for their babies.

The game will be different in gameplay like Phantom Hourglass, if that's what you mean by casualizing. Twilight Princess was not casualized at all, it was easy, but it wasn't approachable, that's what it really means. You can make the next Zelda deep and challenging so long as it's easy to start with it. That's all there is to it, and that's what we can expect for sure.

But whether or not it sells so much is up in the air. I think Nintendo would like to include as many gamers as possible in the Zelda universe, and that includes the new gamers. The women and all ages. As far as young people go, that's who the original Zelda sold to, and that was a hard ass game by the way. So if it does rebirth in some fashion it shouldn't come as a surprise that youngsters will be attracted by it.

About the same as "The Legend of Zelda: Ocarina of Time".

Zelda Wii is the first Zelda for Wii in my point off view
I think maybe one or two million more than OOT

10 to 12 mill and it will be in 2d