There are several new futures includes in DS 8.0.1 compare to 7.5 version.In 8.0.1 IBM included Quality stage, IBM information server (profile stage and audit stage) . these are not
available in 7.5...
Compare to DataStage 7.5 Accential DataStage, with DataStage 8.0 IBM websphere datastage Architecture got changedIn 8.0 IBM included client components of IBM information server which supports profiling stage along with Quality stage features are included in designer client component.