Just heard the good news from Serina Clark and wanted to pass it along:
"I am happy to announce that we now have available the TaskTop Dev plugin for Visual Studio which supports VisualStudio 2015. Through our new partnership with TaskTop, our VisualStudio plugin will stay relevant with the new releases of Visual Studio. To see details on this new IDE connector please reference the following help page where you will see a link to the TaskTop page.
On this page you will also see that our old IDE plugin is available for VisualStudio2015, but it is not supported. We encourage you to use our new TaskTop dev IDE plugin."