Kingdom Hearts 3D, among 31 other games, will be shown at Nintendo World on Jan. 8th to 10th. Unfortunately, it won't be playable. For a full list of all the games to be shown, click the link below.
Source: 32 Nintendo 3DS titles to be shown in Tokyo next month- Destructoid
Edit: OMG Disregard there has already been a post about it. I thought I would be useful for something, close thread!