Strange, don't know how it let you post as 'unregistered'.
Definitely possible expansions, but of course all that is also tied into how popular the game is, so make sure you get all your friends also interested.
As this is the official forum this would be the primary discussion point for the game, and then there is also a BoardGameGeek entry (there's a link to it on another thread here) which can also be used for discussion. There's no specific mailing list for the game, but our newsletter will have periodic information on it.