In Visual Studio 2015 Preview (Pre Release), how can I add a service reference for a WCF
service?
There is a new Visual Studio extension which allows you to add and use service references like in previous versions. It is also compatible with the new CoreCLR, I have just tested it.
http://blogs.msdn.com/b/webdev/archive/2015/12/15/wcf-connected-service-visual-studio-extension-preview-for-asp-net-5-projects.aspx