Study Text for F4 – December 2015?

Hi I have just looked through the syllabus from September 2014 – August 2015 and September 2015 – August 2016 and they are identical. Even at the end of the pfd document for the new syllabus they stated:
” SUMMARY OF CHANGES TO F4 ENG
ACCA periodically reviews its qualification
syllabuses so that they fully meet the needs of
stakeholders such as employers, students,
regulatory and advisory bodies and learning
providers.
There have been no additions or deletions to the
syllabus.”

Does that mean that the BPP books will have exactly the same content for both years? There is a new edition book for exams until August 2016, and the old edition for exam until June 2015. Would you recommend buying the new version which seems to be a lot more expensive or is it safe to get an old one? 🙂

It is my first exam in December, and I am all new to ACCA so would be grateful for any help! x