I think it's time to link this post again, quoting all the official info from Nintendo (and Reggie), seeing how we reached again the "We don't know" phase:
http://neogaf.com/forum/showpost.php?p=228670270&postcount=3384
Case in point:
You just see Reggie staying on script on what he is allowed to or wants to say at this point. But: explain to me why the Japanese hardware spec site specifically mentions that the headphone jack is for audio and microphone headphones?
That's one official piece of info people like to exclude in such lists.