Well, maintainer, yes, creator, eh: meme did most of the original work ;p.
But yeah, I didn't touch the version, so it'll pick up updates as usual

.
(Note that it only includes the KFX fix, and has extra-broken model detection on Windows with Calibre >= 2.50.1

).
TL;DR: Unless you have an urgent need to work with KFX files, wait for the actual release

.