Great, thanks for ruining that!
Just kidding. Judging by the reaction of Windu and the other Jedis in that scene, as well as the noise Palpatine makes, it appears that Palpatine turns into some kind of monster with the resulting conclusion that he kills them all. At least that's what it seems (him turning into a monster) like to me.
I haven't thought about the original trilogy in some time, but this thread makes me want to raise some questions that have been bugging me:
-since Anakin built 3PO, how come they never acknowledge each other in the original trilogy? Was it just Lucas retroactively trying to create a tie-in, did 3PO not know Vader was Anakin, or did he know and wanted to have nothing at all to do with him?
-why didn't Padme change Luke's last name?
-why wasn't Ben trying to keep in close contact with Luke, i.e. trying to train him earlier on?