Just updated myself without a hitch and for those who haven't seen it a leaked build of 4.4.2 NC2 has been released rooted you can find more information here:
★ [ROM/ROOT][N900VVRUCNC2][4.4.2] Stock Root Odex/DeOdex [04/23/14]★ - xda-developers
Psa: DO NOT TAKE OTAs after updating to kitkat leak (nc2) - xda-developers
You will need odin 3.09 to flash the firmware, Download your zip and firmware at the first link, put the zip onto phone, boot into safestrap. Stock slot wipe/factory reset, flash the NC2 zip, then reboot into download mode.
Once In download mode hook up USB, open odin, make sure you have com port and select your md5 firmware in the AP slot.. start, let it finish and reboot into 4.4.2 .. updated safestrap 3.72 link in second link psa
Good Luck
★ [ROM/ROOT][N900VVRUCNC2][4.4.2] Stock Root Odex/DeOdex [04/23/14]★ - xda-developers
Psa: DO NOT TAKE OTAs after updating to kitkat leak (nc2) - xda-developers
You will need odin 3.09 to flash the firmware, Download your zip and firmware at the first link, put the zip onto phone, boot into safestrap. Stock slot wipe/factory reset, flash the NC2 zip, then reboot into download mode.
Once In download mode hook up USB, open odin, make sure you have com port and select your md5 firmware in the AP slot.. start, let it finish and reboot into 4.4.2 .. updated safestrap 3.72 link in second link psa
Good Luck