After holding off on the kitkat bandwagon for a while, I decided once the OTA was available that I should just do it.
Background - this is a D802 european model with root on stock 4.2.2 firmware. I also have TWRP 126.96.36.199 installed.
Prior to proceeding with the update, I made a backup of the phone and rebooted the phone a couple of times to make sure everything was okay.
After that, I then clicked install on the OTA and the phone rebooted. After rebooting it has been constantly going to TWRP. I have tried wipe dalvik, wipe cache, restore backup, restore factory settings, reboot to system but nothing works.
Also, trying to get into download mode just boots into TWRP. When I try to do a adb sideload, the device just shows up on the PC as LG-D802 and no drivers are found for the device so I am not able to install a new firmware or can't try to go back to stock either.