Sound sound sound has always been a consistent weakness with dslr and ilc cameras etc. Here's are a couple ideas a little outside the box...and probably total fantasy, but would be great
1) Get rid of that sub-mini microphone jack. Really weenie! and put a 3.5 mm (This is the obvious improvement)
2) Integrate a mic input and audio out into or near the hot shoe while keeping the (new) 3.5 mm jack as well
3) Create an adapter/extender for the hotshoe that will have a 3.5 mm jack AND a headphone jack for monitoring with a cold shoe on top for a mic.
OR
4) A battery grip that serves as a battery grip and also plugs into an audio interface on the underside of the camera and allows 1 or 2 XLR inputs and a headphone jack.
Sort of a modular approach that would keep size down when you want to shoot light or naked (Not you. the camera.)
Also...peaking would be lovely. I shoot a lot of news and chaos with my GH2. The shimmery thing the screen does works well for focusing, but when there is chaos, bright sun, smoke from a fire or other distracting factors, peaking would still be helpful.
Example of chaos: http://youtu.be/M5Eb1ijszNg