Are there any capabilities currently in Bamboo to setup deployment rules? In other words, we would like to be able to setup a 'promotion workflow' between environments to ensure that a release is approved before moving on to the next environment.

NOTE: Sarah Goff-Dupont mentioned this feature was on the short-term roadmap back in July 2013 in this article, http://blogs.atlassian.com/2013/07/release-management-jira-bamboo/.