At this point in the life cycle of the game, it's very unlikely that we will add support for more than 4 players.
This is because the entire code was written for 4 players, so we would have to rewrite a lot of the game to make it work. In addition to that, we would need to change things like the User Interface (UI), game rules, etc.
We agree that more than 4 players would be cool, but we don't think we'll do the herculean work to make it happen now.