The yet to be released entry to the Batman Arkham franchise known as Batman Arkham Origins releases next week here in the US on October 25th. Sources have uncovered the complete video upload of the entire game playthrough including all addon DLC packs.
via N4G: pc news feed http://n4g.com/news/1379462/batman-arkham-origins-walkthrough-leaked-online
via N4G: pc news feed http://n4g.com/news/1379462/batman-arkham-origins-walkthrough-leaked-online