Academics have viewed migration from many different perspectives. This paper asks what is new about how migration impacts on population change and inversely how does population change produce new migration outcomes. Three features are singled out. First, the significance of structuring forces such as international recruitment agencies and social networks are identified as very important in shaping the impact of migration on host populations. Second, it is noted that population mobility challenges traditional patterns of care provision across the life course. Third, the changing significance of contextual factors (space, place, and household environments) has transformed the impact of migration on population change. The paper also explores how new datasets and new research methods can offer novel insights of the relation between population mobility and demographic change. Copyright © 2013 John Wiley & Sons, Ltd.