Oracle E-Business Suite Release 12.2 includes many significant new features and some of them are updated frequently-enough that their main documentation is published via My Oracle Support Notes rather than the guides that accompany each major release.
We have published a new My Oracle Support knowledge document to make the official EBS 12.2 Notes from ATG Development easier to find:
The notes listed in this Oracle E-Business Suite Release 12.2 Technology Stack Documentation Roadmap (Note 1934915.1) apply either exclusively to Release 12.2, or to 12.2 and stated earlier releases. This documentation roadmap will be updated every time the Applications Technology Group releases a new EBS 12.2-related Note.
What about earlier EBS releases?
We have published documentation roadmaps for EBS 11i and 12.0 / 12.1, as well.