Hammer and Bolter: Death's Hand
Another animated show project currently being developed by the Games Workshop Storyforge guys.
Completely different animation style to Angels of Death from the looks of it. So, it seems they're serious about branching into this area, because they seem to be experimenting with a number of different styles and stories. Because we've got Eisenhorn in the works, which is Inquisition-based and live-action, Angels of Death, which is 3D animation and centered around Space Marines, and now this, which is 2D and focusing on Imperial Assassins.