Don't make the mistake that a European licence allows you to work anywhere in Europe.
The EU is preparing a directive which defines common training standards for ATC, new ratings (comparable to ICAO), and MUTUAL recognition of other states licences.
Each state will make its own legislation and will issue its own licence. But ... it is NOT a European licence. This will probably mean that an EU state must accept the licence of another EU state as proof of training and qualification, but you will still need a licence issued by that state to operate within its jurisdiction.
The EU directive is intended to improve freedom of movement of controllers between states (through common training standards and common ratings), but there is NO SUCH THING as a European ATC licence!!!