New HR functionalities with EHP4

Dear SDN users,

We going for upgradation from ECC 6 to EHP4 . So I want to know how it is going to affect SAP HR ?What are the additional functionalities we can do in EHP4 when compared to ECC6.0?which submodules like PA,Recruitmentetc.,are getting affected ?In what way it is getting affected?what are the major affects in sap hr when upgarding to EHP4?What will be the role of consultant in HR upgradation to EHP4 like testing or any configuration?

Please reply ASAP