http://wii.ign.com/articles/890/890276p1.html claims that Miyamoto said "The thing that's difficult is that, as you know, the way we handle our announcement is we work on product and once the product is at a state where we feel it's ready to show to people, then that's when we're willing to talk about it. Which is why it's difficult for me to talk about different projects in interviews." Unless the game is near finished, it won't be announced. (maybe Brawl scared them out of promises)

Proof to back up this statement? Look at the release dates of the announced games.

• Animal Crossing City Folk: November 16, 2008 (four months!)
• Mii Music: Q4 2008
• Rayman Raving Rabbids TV Party: November 2008
• Star Wars The Clone Wars: November 2008
• Spore Creatures: September 7, 2008
• Grand Theft Auto Chinatown Wars: Q4 2008

Notice how none of these games are slated for a 2009 release (or if I do understand Q4 2008 incorrectly, no later than March 2009). The only counter example was Wii Sports Resort will be released "globally next spring" as stated in the E3 Pres Conference, and those few TBA released dates.

I'll just generally yell at those complaining about Nintendo's E3 conference; Nintendo's conference wanted to announce concepts (using the DS to get baseball scores and stats. (I like it), Wii Speak (AC was only announced to accompany it), NON-COMPETITIVE GAMING (Wii Music > Guitar Hero instantly because of this, IMO))