Anyway of rooting 4.4.2 yet ?
If anyone tells you yes today (April 1), I wouldn't believe it.
Just to add another data point, I was rooted using Kingo, and lost root with the NB4 update. I attempted to take the KK OTA on two consecutive nights, failing at around 29%. Then I re-rooted using Kingo and restored a handful of AT&T apps I had previously backed up and uninstalled with Titanium (I didn't have Pro then so I uninstalled rather than freezing). A couple days after restoring those apps (both system & data), I tried the OTA again, and it worked. I'm now on KK.
That said, even though I'm official, Isis still knows I was previously rooted, and won't run. I imagine it's just seeing SuperSU and perhaps other signs of the old root? Makes no difference to me at this point, just curious.
I will say, KK does seem more snappy. I know that could be my imagination, but it does seem like I can feel the extra free ram so far. I just miss the green battery indicator.