Ridiculous. We are at least a couple of years before even considering a possible Wii HD announcements.
A lot of what you mentioned as reasons have a lot of explainations. Explainations that you will learn as you continue to watch the game industry closely. A big one is the secretivity with which Nintendo chooses to keep regardless of how set they seem to be. They don't usually announce a lot of games until a few months before they are to be released. Sometimes they could go years without talking about a game, just to have it resurface with all kinds of information. They also have a strong control over 3rd parties and what games they announce. Nintendo will tell companies to keep games secret until an appropriate time and venue.
To better know what the companies will do you have to watch their announcements, know their tendancies, watch sales numbers, etc.
Granted crazier things have happened, but not traditionally with Nintendo. Not when a console is selling like crazy. But then, I know they are really worried about the Japan situation.
