Sam Freeman alerted us to a report from a source at Dark Horizons. Here's what the spy had to say. Highlight to read!:

"Darth Sidious has a curved lightsaber. That doesn't mean that the blade is curved. It means that the handle is curved. There are two stories about yoda's lightsaber. One is that it is in his stick. The other is that he has two lightsabers. This sounds realistic to me because on set there were some extras (dressed as Jedi) practicing with two lightsabers. But it is hard to get a fix on cause Yoda is going to be mostly CG. Both Obi Wan and Anakin get their arses kicked by Ducu (sp?) played by Christopher Lee, but Yoda comes out and does some kicking of his own."

As you can see, this is a slight variation on what we reported on the curved lightsaber. Also note that Christopher Lee's character is Count Dooku. Stay tuned for more!