Somewhat on topic, but not a perfect solution.
When using a monitor, I was able to get the display to stay on. Audio levels, TC, record tally, battery life, record duration, time left on card...
I was recording for over an hour & all the info stayed up on the HDMI display (I had shut off the camera's screen).
I used the GH3 for a few hours and I found the disappearing info so annoying that I returned it. But I did not try an external monitor. It's a much quicker fix than waiting for a firmware update. Thanks for the tip!