There is a feature I used in 9.0.2 that I miss (and has caused me to revert from 9.0.3).
I work on a HUGE maven project with hundreds of modules. Worse, the source code is in a SVN repository overseas (with a slow connection).
I loved the "Add Maven Projects" (the plus button) in the "Maven Projects" panel. I could select the POMs only for the sub-projects I needed. Behind the scenes, IntelliJ would add the directories to the Subversion directory list (assuming the directory was in Subversion). And would remove it (via a prompt) when I used the "Remove Maven Projects" action.
However, that no longer occurs, and I have to go to Settings/Version Control and manually add the directory.
Perhaps there is some setting some place to re-enable this behavior, but I cannot find it.