Either with the next or the next-but-one release. The missing parts are mostly code clean-up, we also have to decide about the concept of a postprocessing DLL to be used by both shaders.
If this is a DLL especially designed for the HDR and PSSM shaders please don't do that. If this is a generic DLL for easy integration of complex shader chains, this is OK, as long as you provide the source... otherwise why not writing it a .c/.h file for each shader solution like pssm.c/.h and hdr.c/.h?