EPA SWMM 5.1.011 is now available for download at EPA's webpage:
https://www.epa.gov/water-research/storm-water-management-model-swmm#downloads
Here are the changes...
EPASWMM5, Autodesk InfoWorks ICM_SWMM & ICM
EPASWMM5 for Hydrology, Hydraulics and Water Quality