The current lab test – called the New European Driving Cycle (NEDC) – was designed in the 1980s. Due to evolutions in technology and driving conditions, it has become outdated today. The European Union has therefore developed a new test, called the Worldwide Harmonised Light Vehicle Test Procedure (WLTP). The EU automobile industry welcomes the shift to WLTP and has been contributing actively to the development of this new test cycle.
Good update here: http://wltpfacts.eu/what-is-wltp-how-will-it-work/