I asked AQA about this and received the following reply from AQA:
Both A2 Principal Examiners have agreed that as DSM5 has only just been released, students will be credited if they do use it effectively but examining will reflect both versions of the manual. At least for this teaching year, examiners in summer 2014 will be made aware that coverage of questions using DSM4 can receive marks across the scale.
Hi,
I’m studying A2 AQA Psychology and noticed that the DSM 5 got rid of primary and secondary insomnia to avoid differentiation between the two and to make the treatment choice easier. Would this comment be creditworthy as AO2