As the rich and powerful from across the world get ready for their annual brainstorming in this ski resort town in the coming week, it will also host Hollywood actor Leonardo DiCaprio - but not for his Oscar front-runner 'The Revenant'.

Plunging markets and the break-neck pace of technological innovation. The world is beset by uncertainties as 2,500 business executives, political leaders and activists gather in the Swiss Alpine town of Davos this week.

Europe's migrant crisis and devastating terror attacks will combine with the plunging oil price and China's economic slowdown to give the elite of the political and business worlds plenty to talk about when they gather in Davos from Tuesday.