The "trunk" series represents the primary line of development rather than a stable release branch. This is sometimes also called MAIN or HEAD.
This is the next major release of the Quantum python api. This release includes significant changes to the python API while maintaining the existing CLI.
This version of the client will be released during the OpenStack Liberty release and will contain backwards incompatible changes.
This is the 2.3 series of python-neutronclient.
This is the current stable series