Well, recently he also posted this:
Actually, having seen the article (which is barely a quarter of a page), there aren't many spoilers. If you watched the trailer, you probably know most of them. And one of the points they mention isn't even in thee movie anymore -- which will confuse the hell out of people who read the article and then go to the film expecting to see it!
He is refering to this week's Entertainment Weekly, which has a Star Wars cover (actually, six of them) and includes a ROTS spoilers sidebar (which they admit they took from the graphic novel). So what did EW reveal? Let's take a look:
1. Count Dooku falls prey to Lucas' hand-chopping fixation.
2. Chewbacca not only makes an appearance but performs a crucial service to the Jedi.
3. Mace Windu meets his end in a battle with Anakin and the Emperor.
4. We see the first Jedi Master to communicate from beyond: Qui-Gon Jinn sends messages to Yoda.
5. Anakin seals his shift to the dark side by leading a death squad into the Jedi Temple
My money is on the Qui-Gon scenes having been cut from the movie.