Hello Suhel,
First of all... DON"T WORRY! PMI has a very long timetable for this particular change. It will take up to 3 years until everyone is switched over to the new system.
The final decisions on how things are changing and when exactly they are changing will be made public by PMI in the next 3-4 months. Until then we just have to wait. So for the time being we can pretty much say that "nothing changes" and you can continue to earn & claim PDUs as before.
For more details, please listen to my PM Podcast interview with John Kleine from PMI, where he explains many of the changes:
www.project-management-podcast.com/index...categories-explained
The most important fact from this interview is this: MOST of what you know already about earning PDUs will remain the same!