Copy JIRA project configurations to other instances with Project Configurator
Including custom fields, workflows, schemes, roles, …
Creating new objects or modifying existing ones.
Simulated load feature (preview).
During last Euro Summit at Barcelona, Keshav Puttaswamy from Atlassian gave a very interesting presentation about the Data Center suite of Atlassian products. The presentation is available in Slideshare if you want to see it.