Allow views to be automatically updated even if they contain some non-updatable columns
Allow control over whether INSERTs and UPDATEs can add rows to an auto-updatable view that would not appear in the view. This is controlled with the new CREATE VIEW clause WITH CHECK OPTION.
Allow security barrier views to be automatically updatable
http://www.postgresql.org/docs/9.4/static/release-9-4.html
My favourite parts:
Allow views to be automatically updated even if they contain some non-updatable columns
Allow control over whether INSERTs and UPDATEs can add rows to an auto-updatable view that would not appear in the view. This is controlled with the new CREATE VIEW clause WITH CHECK OPTION.
Allow security barrier views to be automatically updatable