the 3xx designation is not a hardware rev, its just a production date

310 - Oct 2013
311 - Nov 2013
312 - Dec 2013

Guess what is going to happen right after New Years..

401 - Jan 2014

All of this stuff about new hardware is probably BS. Things are probably fitting better/rattling less/not as yellow/blah blah blah because they arent shipping out bad phones rather than magically making them better.

One guy on Reddit gets a phone that rolled over from 311k to 312k that happened to have a larger speaker hole by 0.002" and automatically that means Google updated everything. Not so fast...

LG G Pad 8.3 - GPE