Hmm...
I am very, very, very happy with my GR. I cannot think of a more successful (for me) small single-lens camera. I have never encountered WB or dust problems, and I carry it pretty well every day (it is beside me now, in my briefcase). It wears an Acmaxx screen protector and front filter (which may be why I have not encountered dust issues...) I drove over my GRDIV and all it needed was £60-worth of new rear screen.
In the future, I don't want WiFi, or (shudders) a tilty screen. I would love a built in optical finder, even if it is squinty it would be better than nothing. I don't ever use the flash. I would appreciate a bigger sensor, just purely to get larger files when used in "digital crop" mode (which I use a lot, I confess).