Alright, for the Death Watch reboot my hope is to bring up a simple premise.  The Space Marines will be part of an expedition that moves from planet to planet along the Outer Reaches, inspecting sensor arrays and collecting information.  An Inquisitor will be moving with them and the Space Marines are essentially baby sitting a member of the Ordo Xeno, so far as they can tell from their angle.  We will reboot the game with their landing on Bacchus, a once Imperial pleasure world.