My guess is that given the time, effort and cost that appears to have gone into developing and deploying KFX, Amazon plans for it to be something major, rather than just an optional format used on some devices. I suspect that once they complete development of it to the point where it supports all of the features using in existing books they will phase out MOBI and KF8 and eventually support only a single e-book format. At that point kfxgen may replace kindlegen as the means of preparing books for sale by Amazon. Time will tell.
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