If you are a Windows Phone or Windows Store App developer , you might want to try out the Windows 10 Development tools to build Universal Windows Apps targeting Windows 10.
The Visual Studio tools for Universal Windows Apps is now integrated with Visual Studio 2015 RC setup .
When installing Visual Studio 2015 RC , you will have to select “Custom” and then click Next and later select “Universal Windows App Development Tools” and “Windows 10 Mobile” emulator to install the Universal Windows Apps development tools.