For an overview of what motivated us to basically start from scratch on this applet as well as occasional progress statuses, please see Jan's blog.
A picture, even better a video, is worth a thousand words they say, so here it is :)
The initial email has been sent a few moments ago to the @kde-packager mailing list, so you can expect Plasma NM to land in your favorite distro's update channels anytime soon. Fedora, among others (Kubuntu, openSUSE), already contains a preview snapshot of the applet, with the update to the final version in the works.
Alternatively, you can grab those 3 tarballs and compile by yourself:
 $ yum install kde-plasma-nm