Now Playing magazine has an interview with Genndy Tartakovsky about the upcoming episodes of Clone Wars:
“After the first batch we were all exhausted, and we were starting to move on to do other things,” explains the animator. “And then all of a sudden we were contacted that they wanted to do another batch. And I wasn’t really interested in doing another one because I thought, ‘Well, it’s really hard.’ And I thought more Clone Wars is not going to be as interesting. But then I met with George and he told me he wanted to do a story where it ties in exactly to the beginning of Episode III, and that got me excited because it seemed like it’s really part of the mythology, and it’s coming from George himself — that he respected [Clone Wars] so much that he wanted us to tell the story of the scroll from Episode III.”