KF8 superseded, but did not completely replace, the old MOBI format. The same type of transition is now in progress with KFX. That is now the primary format in use for Amazon-purchased books on newer devices. Things at Amazon are moving back to being more proprietary again.
ETA: Of course, just as MOBI is still supported, Amazon is unlikely to ever remove support for rendering KF8 format. But I believe it is likely that it will be frozen at its current state, with new e-book features coming only to KFX.
Last edited by jhowell; 08-25-2016 at 04:38 PM.
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