The first set of radial distribution system test feeders was released in 1991, designed for comparison testing and benchmarking of software programs and unbalanced power flow solution algorithms. These feeders were made available for public use, and since then, hundreds of researchers have accessed and published algorithms and methodologies based on these feeders. As computational capabilities increase and the needs of users incorporate more advanced technologies, the requirements for state- of-the-art distribution analysis tools and the need for models to validate them increase. The IEEE PES DAS Test Feeder Working Group has expanded beyond its original scope to address the needs of ongoing research and development. This panel session will discuss current developments from the WG (including meshed networks, urban cores and time-series solutions) and the planned road map for future development.