While implementation of HRRRv2 and RAPv3 at NCEP occurs August 2016, ESRL/GSD has developed a new set of assimilation and modeling changes for HRRRv3 and RAPv4. Improvements in boundary-layer assimilation and a variation/ensemble approach for cloud/hydrometeor assimilation have been developed already showing improvements in real-data tests. The WFIP2 project has spawned effective further refinement to physics parameterizations for boundary-layer wind and subgrid-scale cloud prediction. These changes and their real-data testing will be described. Finally, progress toward a full 3km HRRR Ensemble in prior 2016 and upcoming 2017 demonstrations will be described along with HRRRE likely contribution to strengthening of weather guidance for variable generation.