I feel most of the people(specially newbies) will be not aware of gamification and how it works in community ?
So my idea is about providing a link to a document which have information about gamification concept and how it works in community in getting started group .
So it makes people know more about it and inspire them to participate more.
Just like the above link ,there can be a link for Gamification with bold color which attract more towards it.
We can add this as a task to "Welcome aboard " mission too.