There's a huge number of bug fixes and gameplay enhancements, including an option to 'speed up' walking animations. The best part of all is that the add-on is free.
The studio has posted aof features and improvements over on the Steam Community page for Space Hulk. The free campaign is now live over Steam.
“We wanted to give the community a big ‘thank you’ for the wonderful support they have shown, through the first stage of launch, and we think that fans will really love the Messenger of Purgatory campaign," said Full Control. “This game update addresses many of the fan requests and suggestions that continue to hone and refine the experience of Space Hulk."