The elements of the can be categorized in two broad groups: an Ultra-Sensitive Array, with many separable improvements to the on-site capabilities, and an A+ Configuration, an expansion of the array by a factor of about ten with antennas that will also be cross-linked to the VLBA. The combination of these enhancements will yield an instrument with many fundamentally new capabilities, as well as significantly improving the imaging and scaled-array performance of the VLBA.