Today Atlassian JIRA have made JIRA 5.2 EAP1 publicly available, highlights in JIRA 5.2 EAP 1:

• New Issue Navigator
• Workflow scheme viewer
• Getting started
• Copying and editing issue collectors
• Plus much more... 

Read all about them on our JIRA 5.2 EAP 1 (m3) Release Notes.
We do not recommend you use any EAP in production as they are not supported, so please use them in a testing environment.

You can download the latest EAP from here.