Yep, it's a feature of the updated eink driver featured in the KOA2
.
(Note that the capability *for the eink driver* to invert the screen has been there for quite a while now, what's new in the KOA2 is the implementation of a waveform update mode tailored for that. Anyone that has ever tried a nightmode hack should get what I'm talking about (namely, that it won't look like nearly as much of a hot mess when turning pages)
).