Whether you do it now or in 2016 will make little difference except that usually the longer you go, the more training it takes to achieve test standard.
Under the new rules you must go to a school, do training as required and pass the Proficiency Check with an examiner. The Examiner can sign you up so long as it has not expired by more than 3 years. If it has expired by more than 3 years the paperwork will go to the CAA and they will charge to reissue the rating. In addition to that, you will have to pay for a new EASA licence as they cannot reissue a JAA licence.
So the clue is don't let it go beyond 3 years!