Your JAR-FCL license will automatically become an EASA license once you renew it. And since a JAR-FCL license only needs to be renewed every five years, you may be hanging onto it until somewhere in 2017, depending on your last renewal date.
Unfortunately that doesn't mean that you can exercise the privileges contained within it as-is. You are still bound by EASA rules, even though your license still says JAR-FCL.