It has the following advantages over the previous version:
The Electron framework also allows for easier packaging of the application and Mac OS X packages is now also available. One the aims is this version is that maintaining and supporting it will be easier and that the application will offer similar experience on diffent platforms. This is also the only version I currently plan to support in the future, however the old versions will remain available and open for anyone to modify and make new releases.
If you’d like to contribute code or documentation you can do it on Github.