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A a rule of thumb then CCC follows the MM versions when it is features that involves database changes such as using new metadata. You can go to CCC5.6 7 Release notes to see all release notes for CCC.
Breaking Changes: Going from 5.6 to CCC +5.7
Photoshop/Illustrator
From 5.7 going forward, when users are not already editing Photoshop or Illustrator documents and insert an asset image, a new document will be created and the asset will be inserted into the document.
Breaking Changes: Going from 2.1 to CCC +5.5
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