Zelda was a launch game for Wii and a final kiss to Gamecube, which is a different pattern than in previous generations. As has been stated, the DS Zelda had a big internal team as well and I don't think the team wants to spend its entire time at Nintendo making Zelda. They are entitled to work on their own projects.
You have to consider what internal projects Nintendo can do that would drive sales and Zelda isn't really one of them at this point for Wii.
This tends to be about the time Nintendo reveals new projects as well. You've got to figure Pikmin 3, Animal Crossing, Kid Icarus are the big projects internally or cooperatively with other devs. Besides those, I think we could see some broader partnerships with companies like Square-Enix after watching how successful Mario & Sonic was for Wii & DS. Things like Disaster, Wii Music, Wii Ware are going to get top billing as well, and thats before you look at DS. Since Zelda tends to get a ton of hype, but only drives sales the first time it releases on a new platform, you have to figure it won't be shown just so some of these other projects get top-billing.
People are difficult to govern because they have too much knowledge.
When there are more laws, there are more criminals.
- Lao Tzu
