No, there are no changes implemented in the stages of the respective exams. Every exam will have unchanged number of stages such as If there are three stages in IBPS PO i.e: Prelims, Mains and Interview then it will be conducted in three stages. The only difference is that the prelim will remain common for no matter which exam you want to apply for and Mains and Interview will be conducted by the earlier exam testing agencies. In this case, it will be conducted by IBPS. Hence it is a common test drive for preliminary exams only.