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. However the entire Batman Arkham Origins Walkthrough of these videos is in Russian.
If interested, there's a full online strategy guide, here: Complete Online Batman Arkham Origins Walkthrough
Here's the brief summary of the story as seen on Batman-Arkham-Origins-Walkthrough.com:
We've uncovered the special set of videos that will allow you to see the entire play through for all the Batman Arkham Origins Walkthrough as well as all the addons for the entire game including: Alice In Wonderland, Lady Shiva, Bane's Venom, Black Mask, Anarchy, and the rest of the entire game (in Russian Language). So far this guy has a little over 12 hours of video. Also the person playing is not exactly one your better gamers, but regardless, this set of assets is still worth putting it out there since the game does not release until next week here in the US.
Here's the link: Batman Arkham Origins Addon Pack Walkthroughs