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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 CCC5.7 Release notes to see all release notes for CCC.
Breaking Changes: Going from 5.6 to CCC +5.7
Photoshop/Illustrator
In version 5.7 and later, if a user tries to insert a non-document asset into PSD/AI when there is no active document present, a new empty document will be added before the asset is inserted.
Breaking Changes: Going from 2.1 to CCC +5.5
Below you can learn in more detail about the changes from version 2.1 to version +5.5 and the value these changes bring the users.
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