The Docker 1.0 release is an important milestone for this software container project. Their announcement reads, "This release’s '1.0' label signifies a level of quality, feature completeness, backward compatibility and API stability to meet enterprise IT standards. In addition, to provide a full solution for using Docker in production we’re also delivering complete documentation, training programs, professional services, and enterprise support."
Docker 1.0 adds in a new COPY instruction, improves the ADD instruction, new tooling improvements, API improvements, and dozens of bug-fixes. More information on Docker 1.0 can be found from the Docker Blog.