The images were as revealing as could be. Every event of significance in the movie was covered by at least one scene. Even the finale which contains a lightsaber duel between Anakin and Obi-Wan is available for review.
George Lucas must have a hit squad out looking for the guy who leaked these images. The whole story has been revealed. I don't recommend following this link if you want any sort of surprise when you see the movie: http://www.tpu.fi/~t4jlaaks/ep3/
UPDATE: That link seems to be overloaded and / or taken down. As I said before, George Lucas has got to be a little bit ticked about the leak and will be working vigorously to take down all websites with the spoiler images.
UPDATE 2: A new link: http://www.chinese-starwars.com/starwarsepisode3/moviescene/episode3scene.htm