Support for 4.4 is planned. But it's not possible until I have 4.4 device as GB module became really huge. It's now basically a non-flashing custom ROM with more than 40000 lines of code. Impossible to work on it without a device.

However, I would be at least curious to see a debug.log if somebody already tried in on 4.4. New framework makes debug.log sharing more easy.
Nexus 5 running stock KitKat + GravityBox
GravityBox app - Xposed module for devices running vanilla Android
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