Most likely early 2015 per the current rumors.
Gotta get released and then sent to all the Nexus devices first.
Mav.
Sent from the future on my Sprint LG G3.
I don't think the Android version will make your G3 run better. That is up to LG to release firmware updates to the phone. If anything, upgrades to Android will slow this phone down, until LG releases firmware updates to adjust.
Except there are no updates to the Android Runtime in 4.4.3 and 4.4.4. It uses the same code as 4.4.2.well who knows if it will make it run better but 4.4.3 or greater will address bugs are found in 4.4.2 whether we are aware of them or not and never know if it does have an effect on our G3... it could be the difference whether ART works better on the G3. And of course it gives LG the chance to include any firmware update and even ATT to update any issues to their mega bloatware. The main issue is that even though I think the G3 is running well... it could be smoother. Just like my G2.... it was ok but an update or two since launch I find my G2 runs pretty well now.