One of the things Satoru Iwata mentioned during Nintendo's E3 show is that they have had this planned out for the past two years, "and were waiting until the technology was cheap enough to release cost effectively"
I don't believe they will go over $199, but I seriously doubt it will be less than $149. mostly because of this statement, and the constant mantra of remaining affordable to the masses, Nintendo knows very well they cannot jump the price on 3DS, plus with IPhone4 impending in the handheld market. DS held off PSP not only by unique gameplay, but also by pricing. If Nintendo wants to be sure no one steps into the handheld market and takes over the way Playstation did the console market at one point, they know to keep the price low. They've already admitted to waiting until the tech was not only right, but also affordable, and that is a savings you pass on to your consumer.
PS3 tech was not affordable at release hence the astronomical price and even more loss, same with X360, where teh tech was not only unaffordable, it was not ready either, hence the frequent rrod's lol