I read that the Obi-Wan/Dark Anakin lightsabre duel is the longest on-screen fight in cinema history -- something like 20 minutes of screen time (broken up by cuts to other scenes, I assume).
The only thing better would be a 20 minute scene of Vader dismembering Jar-Jar.
Lots and lots of $$$ will be lost on the "under 13" market (who are about one month away from gettting out of school)...
PG-13 isn't like R. Theatres don't prohibit children under the age of 13 from seeing the movie, and they don't have to be accompanied by an adult or guardian. Lucas will still make his half-billion dollars.
Actually, I think PG-13 is a smart move. The last three SW movies (including Return of the Jedi) pandered too heavily to children and suffered because of it. The original Star Wars and The Empire Strikes Back were darker and edgier (prior to the "Special Edition" re-releases), and far superior films.