1.) I really like the UI changes for the OS-X version.
2.) The file icons (for AS/MXML) are nice
3.) Unfortunately the Atlassian plugin (2.3.0/2.3.1-SNAPSHOT) throws an exception upon GIT commit. I am not decided yet, if I revert to IDEA 9 just for that issue. Since this is EAP, the Atlassian fix will probably take a long time. Damn.