This document provides a helpful list of changes from ERA 2012 to ERA 2015. The changes are minor. A good one, is a clampdown on abuse of affiliated researchers - some universities submitted a lot of publications by foreign-based researchers that they claimed as affiliates that did not include any mention of the university submitting the publication to ERA. So it looks like that for the moment the aim of measuring the broader impact of research as the UK REF is attempting to do has been shelved. At least as part of the ERA exercise.