In the near term, we aim to extend the optimization to nonbonded interaction parameters and incorporate expanded training and testing data sets. Later, we plan to address issues related to the definitions of chemical types and elaboration of the functional form, such as by the addition of off-center partial charges and incorporation of an explicit treatment of electronic polarizability. At the same time, we hope that the associated open release of our datasets and infrastructure will enable independent use of these data and tools to advance force field science.