I have found the function; earliestUnreleasedVersion() however I could not find a function for latestUnreleasedVersion(). Have I missed something? This would be very useful to me, however I am not sure if it would be useful to others.
No, there is not such a function. You might have found out yourself that you can search for any unreleased version (see included screenshot and the advanced search function reference), but that's about the closest you can get:
Screen Shot 2016-11-09 at 19.51.58.png
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