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You'd have to ask this the CREngine developer(s), but I think it is highly unlikely. CREngine started as a FB2 renderer, had EPUB2 (at least more than enough of it to be useful) added later. Switching that to EPUB3 compatibility is a major feat alone, adding support for a proprietary format on top of that is an immense amount of work. So no, I don't think that will happen soon.
Maybe if some new reader engine comes up, but where from?
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