In addition to stricter standards on emissions, Euro 5 also dictates that auto manufacturers give independent repair shops information on vehicle repairs related to emissions.
Some members of the European Parliament are already calling for talks and deadlines of even stricter standards (Euro 6). Among them, popular starting dates are September 2014 for private cars and September 2015 for light commercial vehicles.
Note: Wikipedia's got a good summary page on European emissions standards.
[Source: Auto Industry]