A lot of the speculation about E:VII revolves around the franchise icon of Luke Skywalker. The impact of the character on the Star Wars Universe be it on film or in the EU is simply immeasurable! That being said... if you knew Luke was going to die in the upcoming film, how would you go about such a monumental event to shake the entire franchise? Personally, I would make sure his death means something BIG! I would set it farely early in the film. I would have him completely ambushed and caught completely by surprise. He would put up a fight none the less, and the fight would also have to be an epic fight setting a tone for all the action to come. Luke doesn't go down as easy as Windu here... He's fighting to the very end, not blind sided and taken out quickly when in a position of strength. I would also have his death be a major plot launching point. The Jedi are reeling at the thought of someone or something so powerful it could catch such a great Jedi Master off guard and take him out. I would have it very much a central mystery of the plot that leads to something even bigger going into Episode VIII which could then take on a very dark tone ala ESB.