ASP.NET 5 is the next version of ASP.NET 4.5. Recently, Microsoft has announced some major developments. Microsoft has announced the open sourcing of .NET, making Visual Studio to build cross platform applications and also announced about ASP.NET 5
ASP.NET 5 and with the help of Visual Studio 2015, you can create modern web applications for all devices, including PCs, Tablets, Mobile smartphones and also work with any browser or operating system.
Scott Hunter talks more about ASP.NET 5 and Visual Studio 2015. Please visit the following link.