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There's always been support for ePub files - it's more that they've finally improved the software to account for differences in versions of the standard and how the reader handles books that don't strictly follow it.
MOBI and LIT seemed more standard as far as the file contents went - I've seen ePub files that render five different ways between five devices, just because ePub is more a container than it is a set of guidelines about how books have to be created and rendered.
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