I don't have any clue about is on Gamescon, but I found this article
"Gamescom is insane. Multiple giant halls filled with video games, besieged by 200,000 people, all jostling for hands-on time – and swag. While E3 is generally thought of as the industry's major event, this Cologne-based behemoth is the true, public-facing epicentre of the gaming year."
You can see some videos with the most wanted games.
I also like the new Batman: Arkham Origins - Nowhere to Run
Very nice idea with the Murasaki Baby
And also Watch Dogs...