The Android 4.4.3 update for the Nexus 10 has been going out over the air recently.
One hoped for fix that I had been looking for on my end would have been to improve the Bluetooth Keyboard compatibility, up to and including the Apple Wireless Bluetooth Keyboard.
Unfortunately that still seems to be not working from my experimentation.
Please feel free to add in the comments your experience with 4.4.3 on the Nexus 10!
Jordan Bortz Consulting