In NSW there is no syllabus for the National Curriculum course, there has been no draft syllabus, and in fact there has been no consultation on the syllabus. The only syllabuses in existence are the national ones themselves which the NSW ones will be based on.
So no, there will definitely be no change for 2015. Also extremely unlikely for 2016. My estimate for the most likely starting year is 2018.
BUT .... why would you sell syllabuses when they are freely available online?