Hi Asus,
Regarding battery or heat I don't perceive any improvement.
Regarding using audio jack during calls with wired headphones, all problems remain I'm afraid:
- phone will shutdown during calls, randomly
- volume will go up to dangerous levels, randomly
- volume during calls has only 5 steps, it is either too loud or too low (and you can't mute it, the lower steps is not 0 volume - this is with or without headphones)
These make using the audio jack for calls quite difficult, is a serious issue I'm afraid.
No perceived improvement to high brightness mode, it would be much better to be able to switch on/off manually.
Don't get down because of complainers like me, our comments are constructive feedback. This product has a very nice set of features and is what many people was looking for, and we just need those major, great features to work properly.
Thanks in advance.