Apparently this is all gameplay footage. It's pretty remarkable.
This is the final entry in the Witcher game trilogy, and things are definitely going down. The Wild Hunt, kind of world-ending horsemen of the apocalypse, are rampaging about the place, Yennifer is back (still don't really know who she is) and another batch of gribbly monstrosities are trying to chew off Geralt's face. We wouldn't have it any other way.
The Witcher 3: Wild Hunt will be released on PC and current generation consoles on February 24, 2015.