This is down to my own personal preference, but I don't believe in updating my games with new content once they've been finished and released. Maybe in rare cases, but it'd have to be something extremely special.
Bugfixes and other similar things? Of course.
But once a game is finished, it should just be finished. I'm no fan of "New Update! Added this, this, and that" type of games.
There will be a sequel, 100%. But as for this one, that's about it. :)