This post discusses the new features in WCF 4.5. There have been significant improvements in WCF 4.5 on configuration.
Simplifying the generated configuration file in client
A client configuration file is generated when you add a service reference in Visual Studio 2010. The configuration files in earlier version of WCF contained the value of every binding property even . . . → Read More: WCF 4.5 Hosting :: New Features in WCF 4.5