Well in the long run this would be an ideal date for launch because of Christmas. People usually do their Christmas shopping early, this means that if they run out of stock in a store, they have plenty of time to restock and get more out the door in time for the holidays. But as Ehingen Guy said, I won't believe it until its confirmed.
This seems to be a recurring thing for Nintendo lately. NA have been getting just about everything before JP. I really don't see the reasoning in it.. JP has a way larger fanbase for Nintendo and the sales there are always a lot better.