How will the roleplaying sessions tie in with the wargame?
Rogue Traders are given access to incredible resources, including command of entire armies and fleets they can use to make war on the enemies of Mankind as they strive to explore the expanse. Of course the Rogue Traders rarely go in to battle themselves, it is more their style to send their forces to act on their behalf.
As part of the strategic cycles, your crew may send military forces to carry out an objective, and this may bring them in to conflict with opposing forces. When this happens, wargaming players (which may also be roleplaying players) get together under the governance of our GMs and fight out the battle between armies on a tabletop with the results carrying forward into the narrative.
Clever planning on the part of the players may give their forces the advantage in these battles, and likewise poor decisions could leave their forces facing an insurmountable foe. Some players may even allow the wargamers to use their character on the battlefield. PCs used in the wargame will be a potent force, though it will carry the risk of death to the character.