Dark Souls is playable on the Gamescom showfloor. Several videos of off-screen gameplay have been uploaded online as a result, showing off the Undead Chapel, Undead Couryards, and Undead Terrace levels, and the Dark Knight and Solaire classes.
Watch them here.
https://www.youtube.com/watch?v=N9m_9nnPjhE
https://www.youtube.com/watch?v=g9CbQ-q1DV8
https://www.youtube.com/watch?v=_QbUVcnqpcg
Dark Souls will release for PlayStation 3 and Xbox 360 on October 4, 2011.