BPC, IP, etc. are generic tools which require definition of content for budgeting. For example they need definition of characteristics and key figures to be used in planning, reporting etc. The layouts for data entry and reporting have to be defined. Authorizations must also be defined. By contrast PBF is a content-rich budgeting application which includes 40+ forms with defined data entry screens for pre-defined decision packages.
The roadmap as I understand it is to allow the customer to decide which of these tools best meets the requirements. Customers with a requirement for quantitative planning such as commercial customers may find BPC and IP useful. For government and other customers with highly defined statutary budget request, approval and publishing processes, PBF will continue to be more desirable.
As far as I know none of these tools is to be discontinued.