ASP.NET 5 includes the following features:
1) New flexible and cross-platform runtime
2) New modular HTTP request pipeline
3) Cloud-ready environment configuration
4) Unified programming model that combines MVC, Web API, and Web Pages
5) Ability to see changes without re-building the project
6) Side-by-side versioning of the .NET Framework
7) Ability to self-host or host on IIS
8) New tools in Visual Studio 2015
9) Open source in GitHub
Here are some helpful links to get you started with ASP.NET 5 Preview:
- Introduction: https://github.com/aspnet/Home
- Documentation: https://github.com/aspnet/Home/wiki
- Music Store Sample: https://github.com/aspnet/musicstore
For more information ASP.NET 5 Overview