Now that the Adepta Sororitas are now available, the Sentinels of Terra supplement has gone up for Pre-Orders. Not only that but Games Workshop has released a video for the release, and the link can be found below.
The Sentinels of Terra will be released on October 26th.
Here is a link to the video
Of course you can order this here.
via Games Workshop
This codex supplement allows you to turn your collection of Space Marines into army of the Sentinels of Terra; the Imperial Fists 3rd Company. It recounts the pivotal year where the 3rd Company stood on the brink of annihilation, its struggle to reclaim honours and glories under the command of the famed Captain Darnath Lysander, and the ultimate triumph over one of the Chapter’s greatest enemies.