I can't speak for some of the technical stuff, however I recently plumped for the EM-10 as an upgrade from my old S-95. Its only done 2 trips with me currently, but impressed so far. Out of your wish list, it includes the Wifi option - I can dump photos straight from my camera to phone and then to facebook if I so wish, plus with the 14-42EZ lens it is fairly pocketable ( with a suitably sized pocket of course).
It does offer live view and the option to switch between the screen/viewfinder - a built in flash also is a nice touch compared to the clip-on flashes of some models. I agree that the lack of weatherproofing is a point, however I went for the Nauticam housing with the vacuum system which certainly helps with improving survivability!. If you just use the housing without tray/strobes its fairly compact compared to the EM-5/EM-1 systems also. Hope this helps.