There are various ways to define "autumn" (astronomical, meteorological ...), but the latest date where you should expect the update is the winter solstice on December 21. The update will possibly be called "Salvation"; you will find the Korean content here: http://boards.rochand.com/viewforum.php?f=55
Please note, some features, like the upgrading of overenchanted Blessed items, were highly controversial in Korea and there is a possibility that they will be removed in the export version, like the upgrading of Boss Jewelry one or two updates ago.