Regarding JSON, I would suggest adding XML alongside HSTORE as related features which allow a No-SQL-like approach. JSON and XML can be thought of as equivalent formats (alongside HSTORE) and while there are perhaps different features there, it helps emphasize the flexibility that PostgreSQL has in these areas.
You are already positioning JSON as one feature among many related ones, and adding mention that we already have XML support just bolsters the view that we are committed to these workflows.
Hope this helps,
Chris Travers
