I don't think there's a recommended text at all. If it's like the last one they put online (minus iTunes), all the reading material will be PDFs on the course's site.
Keep an eye out here for when they start posting the PDFs and other materials: http://cs193p.stanford.edu
Yeah, I was planning to follow the Stanford Class with their notes from last Fall after I got my Mac Book(in Jan), to realize they had removed the content. It was such a relief to find out that instead I can follow the class over a Video Cast and latest content from this semester.