I don't know why some are saying it may not be game related just because its going to be on the international website too. Do people not remember that B2/W2 were put up on Pokemon.com the exact same moment it was put up on the official Japanese website after Smash?
The fact they are making such a huge deal out of it with a countdown etc, there is no way it isn't game related. All this hype just for an event is absolutely asinine. Im also certain it means that whatever games are announced, that an international release will be this year too. I doubt they would reveal a game a year in advance.