Knock code is a simple framework mod, probably only in the lockscreen apk and the touchscreen driver. It *should* be possible to get with a minimal change. If LG had any sense, they'd put it up on the play store for all compatible LG devices and let us update.
It will drop soon enough. Too impatient? Flash one of cloudyfas 4.4 pro or flex ports.
Sent from my Vs980 running Mahdi Beta2 24a