Visual Studio 2015 includes many new features that improve developer productivity while maintaining compatibility with existing extensions and ecosystems. Key new features include support for C# 6.0, ASP.NET 5, Roslyn compiler as a service, debugging improvements like lambda support, and initial support for iOS and Android development directly in Visual Studio. Visual Studio 2015 focuses on enhancing the developer experience with an updated IDE, better debugging tools, and tighter integration with Microsoft platforms and tools like Azure.