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As @Zee and @Diya said, it is better to have the 2013 syllabus.
Having said that, I can tell you that I studied using the 2012 material, and this was mainly because I wrote the exam in Dec 2012 and didn’t pass. So instead of getting the new material, I studied from the old material and referenced this: passingscorefinance.com/LOS/2012-2013/cfa_loschanges1.pdf
The only thing I did get of the 2013 material is the two volumes of Practice Exams that Schweser has. But since you’re writing the Dec 2013 exam, it is better that you go for completely updated material just so that you face no hassles at all.