I have prepared well with PMBOK 3rd Edition, along with other material RITA book (PMP exam prep). I am ready to take exam on 3rd edition, but exam syllabus/reference is changed to PMBOK 4th Ed, from 01-July-09

1)  Can I proceed and take exam on 4th Edition, with my full knowledge on 3rd Ed.

 2) If I prepare 100% in 3rd edition, will it be passible to get 95% same questions in 3rd edition

3) What is the typical time (effort Hrs) to migrate from 3rd ed to 4th Edition.