Please help clarify the latest syllabus for may 13 finals

I read a post which says the study material for all the papers have changed is it true and Have the CA Final portions for all the papers been revised , to what extent ? And would such changes be applicable for May 13 final exams ? (of course For direct tax and indirect tax the latest act with all its ammendments is to be studied , but what about the other papers ) i have all the ICAI study materials that i have been using for the past 2-3 attempts, except for ISCA for whcih i purchased a new one for nov 12. Is it required that all the reference books too have to be purchased afresh ? please inform me , help would be deeply appreciated