Let me be brief. The Australian government has published their Big Data Strategy Issues Paper. Opportunities are in data management, the personalisation of services, problem solving and predictive analytics, productivity and efficiency. The governmental goals are: delivery of better services, improved efficiency of operations, and of course open engagement. For the challenges that remain and the way forward, you can read the whole paper here [PDF]. You should definitely also check out this Big Data Story Map by EMC [Prezi].