. . . not until you click on the planet again. For example, I'm going to invade a planet using Information Warfare; I click on the planet and see morale is at, say, 78%. I place a spy on a morale improvement, move a transport onto the planet and in the invasion screen morale is still 78%. Cancel the invasion, click on the planet, morale changes to 58% and will now be 58% when I invade.