Json-Schema (currently draft 0.4) is exactly what I personally would like to see in Oxygen. There are already Json-Schema validators available for a whole lot of programming languages, like Java, Groovy, etc.

My vote for this feature, too.

Moved from Eclipse to IntelliJ last year (and I love it!).
Since 2004 no plugin for IntelliJ.
Maybe that changes now that Google offers IntelliJ (Android-Studio) for Android, soon.