Tribes Fast Attack was to be a compilation of two separate products in one package: Fast Attack and an updated version of Tribes 2. The new version of Tribes 2 offered two new and exclusive mods called Team Rabbit 2 and Competition Mod, while Fast Attack offered a gameplay experience inspired by Tribes 2 for the PlayStation 2 (developed by Inevitable Entertainment), which is designed for smaller teams and offers a pretty in-depth single player campaign (something Tribes players have been asking for for a very long time).
This title was cancelled in production by the makers of Tribes in an effort to focus the series on future franchise development rather than a quick release of a title the development team didn't have full faith in releasing.