User blog comment:Essie Essex/Bethesda.net - "Dishonored Definitive Edition - An Introduction"/@comment-1500935-20150828184329

Reviews started being posted for the Definitive Edition. Here are some of them, if you want to make yourself an idea about it:
 * IGN: http://www.ign.com/articles/2015/08/28/dishonored-definitive-edition-review
 * Polygon: http://www.polygon.com/2015/8/25/9207847/dishonored-definitive-edition-graphics-comparison

In short, there's barely enough to gain for those who already possess the game and its DLC, or the Game of the Year edition. One new feature to note for the PS4, sounds like the powers' whisperings, the Heart's voice or the spyglass being used are now played on the controller's speaker.