Ever since Cisco announced the news of the changes to CCNA/ICND exams in October 2013 lots of people who have already passed, or looking to sit the current CCENT (640-822 ICND1) exam are wondering what these changes mean to them.
Well don't worry, your current CCENT certification will still be valid after September 2013, but the date you sit the ICND2 exam will determine what version of the ICND2 exam you are required to take.
If you are ready to take the ICND2 before 30th September 2013 then you should take the current (640-816 ICND2) exam, otherwise you will need to take the new ICND2 exam (200-101 ICND2) from 1st October 2013 onward.
Please understand that because the 200-101 ICND2 exam is so new, there will be very little in the way of study materials on the market, so it would be advisable to get your ICND2 exam before the 30th September 2013 deadline so that you can work toward the current ICND2 syllabus.
At the end of the day a CCNA is a CCNA no matter which exams you passed to get there, new or old.