There's an interview at Official Site talkign with Ros Breden who casts the extras. He says the following interesting thing in the interview:

While photos sufficed for most of the extras casting, one particular task required a full in-person casting call. "The casting of the young Jedi was probably the biggest casting session that I did," recalls Breden. "The reason for that was their age. We needed to find children that looked the same -- identical twins, if we could find them -- so that we could use half of them in the morning and half of them in the afternoon."

As revealed in Episode II, before being paired to an elder Jedi as a Padawan apprentice, young Jedi candidates train in classes overseen by Yoda. These children would be seen given lightsaber instruction from the wise Jedi Master. "The first session I did had about 60 children. With parents, and guardians, there must have been about 100 people there. We got them to come here and fill out paperwork, and then quickly took them over to Nick Gillard, the Stunt Coordinator. He ran them through some basic moves of the Jedi. That was a lot of people and a lot of kids, from which we chose about 20 children," recounts Breden.

"The hardest part was trying to keep all the kids happy, and all the parents as well," she continues. "The kids are only four, and it's the parents that are actually more enthused than the children. At four, I don't know that they know much of what's going on. I think it would be fascinating to speak to those kinds in 10 years time, after the rest of the Star Wars films have been released, and talk to them about it."

Along with this and more, there are new photos of Jedi Bultar Swan, nightclub parton Ayy Vida, and Senator Ister Paddie. Check them out!