C Class Coupe (W204) C220 EU6?

[niva441]

I'm think of getting a C class Coupe as the Executive SE spec is almost exactly what I look for in a car (small wheels and light interior option). One difference I notice to the later model saloon is that the diesel is EU5 rated, whilst the later model is EU6. Does anyone know how long it is likely to be produced for and whether it will be updated to EU6?