Microsoft had launched Visual Studio 2015 Preview. Let try to know what's new in this release and point you more details. One of the other large announcements today is that we will open source the full server-side .NET core stack from ASP.NET 5 to the CLR and BCL and this version will run on Linux and MacOS X as well as Windows.
Since the majority of initial comments tend to be questions about supported configurations, I’ll put this up front: before you try to upgrade from Visual Studio "14" CTPs to Visual Studio 2015 Ultimate Preview, first uninstall Visual Studio "14" CTP – if you don’t, your system can wind up in an unstable state.
Microsoft has announced to launch ASP.NET vNext, which includes MVC, Web API, and Web Pages frameworks will be merged into one framework, called MVC 6. This new framework removes a lot of overlap between the existing MVC and Web API frameworks. It uses a common set of abstractions for routing, action selection, filters, model binding, and so on. You can use the framework to create both UI (HTML) and web APIs.