Read this article: http://www.pmhub.net/wp/2012/07/the-perennial-question-the-new-pmbok-is-soon-out-should-i-write-the-exam-now-or-later/
And a great comment by a member:
1 comment to The Perennial Question: The New PMBOK is soon out – Should I write the Exam now or later?
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PMI has announced that the test based on PMBOK5 will not be available until July 2013. And we know from seeing an exposure draft that instead of there being 9 knowledge areas there will be 10. So, more to study. And further, we know that they'll mix up the Inputs, Outputs, Tools and Techniques enough that PMBOK4 will effectively no longer be a useful study tool.
So my advice would be if you have the time and bandwidth to study now, study and take the test ASAP. No reason at all to wait. If you feel like you're missing something by not studying PMBOK5, well the new knowledge area is Stakeholder Management, something currently covered under Communications. So all they've really done is pulled an already existing piece of knowledge out and elevated it to its own knowledge area.