An interesting tweet has just gone live on Nintendo's Japanese Twitter account which teases a "new way to play".
The announcement is coming at 7AM tomorrow morning in Japan, which is 10PM in the UK and 4PM CST.
Nintendo UK has also issued a Facebook post, stating that this is for "kids and those who are kids at heart":
What could this be? Hardware? Software? Something else entirely? Feel free to flood the comments with your predictions.