You could link it to the Mission Planner.
I don't think a whiteboard sort of feature would be smart, but the idea is right.
In the case of a mission, there will be one mission leader (the one who created the mission). The mission leader will be able to display eventual waypoints, armament, targets etc. on the screen.
The rest of the pilots will be sent to the briefing room some 5 minutes before the start of the mission. (And sit on the chairs)
A special radio channel would be feasible for inside the Briefing Room.