A couple of weeks ago I posted a comment in 4/3 rumors that I like to share with you (after a little editing).
After the release of the first model only, the GFx line has a huge potential to exploit yet. Under both design and ergonomics points of view. Although not to be necessarily imitated by Panasonic, Sony's NEX5 is a brilliant example of an innovatively clever and non-dogmatic engineering. As for image quality, the GFx line will follow its evolution as any other camera, with the introduction of backlit sensors, smarter algorythms and better processors. No matter the resolution, which is not an issue anymore. Firmware can evolve too, as it generally did in the past few years, towards a better jpg in-camera processing, thanks to selective noise-reduction and subsequently selective sharpening techniques. Such technology has already been implemented in recent Panasonic models. And good built-in viewfinders aren't too far away.
Menu and user interface are definitely a serious issue in modern camera design. High end DSLR are, basically, classic film SRL from the Fifties with a sensor hammered in, thus shouldn't be taken as good examples of contemporary camera design. On the other hand low-end compacts must rely mostly on soft commands, as mechanical buttons and dials cost too much to manufacturers. IMHO Canon G10 is the first sensible attempt to supply photographers with an effective stills-capture physical interface. Forget about its menus, they are as crappy as the competitors’, but the exposure compensation and ISO dials are a real luxury. Nothing else can help photographer better than that in his expose-to-the-right task. No doubt there is still a lot to do in order to build the perfect EVIL camera as far as this aspect is concerned. For instance, the standard mode dial could be replaced by a more useful speed (or aperture, or both) selector(s). And the card formatting command shouldn't be buried under three menu levels. And why do I have to choose between adaptive and non-adaptive LCD screen luminosity? Of course I need it to adapt itself to lighting conditions! And so on... Leica M digital cameras should be imitated with regard to menu simplification (only to that, I fear). I certainly dream of third-party firmware allowing us to make our life easier and get our cameras to operate more like cameras. Hackers all over the world, unite!
As for lenses, M43 market is still slow. But I'm sure it will be revitalized as soon as third-party manufacturers will start releasing their own M43 glasses. Which hopefully will be firmware in-camera corrected against vignetting, distortion and chromatic aberration, so that they can cost less and, moreover, be lighter and smaller. There is a wide demand, spreading from ultra-fast primes to wide-range zooms (which is my case).