This document introduces ASP.NET vNext, which is a new modular and open source version of ASP.NET that is faster, more flexible, and optimized for cloud deployment. It highlights key changes like being totally modular, using NuGet packages, supporting new project types, and merging MVC, Web API, and Web Pages. The document warns that ASP.NET vNext is not ready for production and is intended to show the direction ASP.NET is headed. Resources for learning more are provided.