When I was at IAAPA, I had the chance to talk a little bit with the designers of the game including Makoto Ishii (thanks to Sam for filling me in on that) and I asked them about updates to the game as it seems that with only three levels operators would want a little more in the game. They responded by saying that they would be releasing updates in frequent intervals (which could be added to the machine via a USB thumb drive) and today we have some news on the first update for the game, which adds new Christmas themed avatars. While the English isn’t entirely clear on the Japanese site which reveals this information, it sounds like they have also added a new stage to the game as well.
Whether or not this update will be rolling out with models released outside of Japan does remain to be seen – for example the game is now in production in the US although when the first games will arrive at distributors remains to be seen and by the time it arrives on locations it might be too late for the Christmas avatars but I imagine that having the extra level would be nice. Still, the constant change of the avatars is a nice little way to encourage some replay out of the game and it will most certainly help if they continue to add more levels to the game.
UPDATE: Thanks to Aaron Auzins int he comments he states that a new stage has indeed been added to the game and in addition to Christmas themed avatars which are available for a limited time, they will have other timed avatars throughout 2010 which are related to the year of the tiger (see the comments for more)
UPDATE 2: Sam from Namco Bandai USA informs us that currently these updates are only available for the Japanese market.