[Documentation] Developing Custom Language Plugins for IntelliJ IDEA

Hi guys,

I am currently following the documentation here which mentions "The information in this document has been updated to cover the API changes and new features of IntelliJ IDEA 11."
Are there any notable/interesting features released under IJ 12/13 in this area?

Also, as a heads-up the link Example: CompletionContributor for completing keywords in MANIFEST.MF files is non-existant within the current documentation - I did not have the access rights to update this information myself :)

Cheers