Next RubyMine 4.0 EAP build is on its way to you. It is very close! Meanwhile let me tell you about one more nice feature that will come with it.
Now you can see the full type hierarchy for a selected class:
… or supertypes and subtypes apart:
That’s it. Hope it will make code analyze and navigation more convenient to you.
Develop with pleasure!
JetBrains RubyMine Team