I think this is a case of Amazon getting fed up with Calibre running rings around its own tools. Some of its ePub to MOBI conversions are pathetic.
If Amazon does extend the MOBI format for the Kindle, are they really going to release a new version of MobiPocket Creator (last updated two years ago)? In any case, I'm sure that Calibre will be able to track the changes if this does ever happen.
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