CC and CC 14 are just a different as CS6 and CC or AE 5.0 and 5.5. Every release utilizes new features that are not supported in previous versions. Also, the release notes are specific concerning previous versions. I'm not saying that I would not appreciate a save as CS6 option in CC 14, but it is not there and not likely to return. You could always get on the Feature Request list. Changes to features are a democratic process. The more votes the more likely things will change. I'm not a software engineer so I can't tell you how difficult this would be to implement but I can guarantee that it would take more work than the way it is now.
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