Not to get anyones hopes up, but there have been 2 rumors about the post Xmas/pre New Year event from Nintendo.
The first was related to the 3DS crossing the 4million mark in Japan and when it reached that milestone, Nintendo has a special game announcement to make (I would assume for the 3DS).
The other was that new info would be released about the Wii U, but I'm sure Nintendo would save that for CES if they had something they wanted to share at this time.
But last month (I think), Reggie did say that there were more games to announce for the Wii, and that we would know more before the year was over or something like that. So this conference isn't unexpected.