I mean have a hologram of Vader on Coruscant. Not Coruscant in the background on the SD.
I also had another idea. How about showing a scene of Yoda upset after Luke fails at Bespin against Vader. SW has had some scenes where Yoda can feel the pain of other jedi. It would be similar to the rumored scene of Yoda in ANH after Alderaan in blew up.