I really like the idea of React Native... similar JS engine constructs, but a leaner UI layer... though, really need a bit more unity in UI controls across platforms.
Another bit seems to be some work in progress from the Xamarin guys at MS.
In the end, an XML based UI combined with a JS runtime engine seems to be a very powerful combination... getting similar points of integration with other languages could be equally nice.
Something resembling Material Design, or Bootstrap as a cross platform UI toolkit with an XML interface would be a great place to start. Electron really seems to be as close as it gets for the most part, with the least cross platform effort.
Another bit seems to be some work in progress from the Xamarin guys at MS.
In the end, an XML based UI combined with a JS runtime engine seems to be a very powerful combination... getting similar points of integration with other languages could be equally nice.
Something resembling Material Design, or Bootstrap as a cross platform UI toolkit with an XML interface would be a great place to start. Electron really seems to be as close as it gets for the most part, with the least cross platform effort.