MVC 2

·         ModelMetadata and ModelMetadataProvider Classes

·         Model Validator Providers

·         Client-Side Validation

·         Client-Side Validation

·         New RequireHttpsAttribute Action Filter

·         Overriding the HTTP Method Verb

·         Single-Project Areas

·         New HiddenInputAttribute for Templated Helpers

MVC 3 

·        New Intranet Project Template

·         Extensible Scaffolding with MvcScaffold integration

·         HTML 5 Project Templates

·         Extensible "New Project" Dialog Box

·         Razor View Engine

·         Support for Multiple View Engines

·         Partial-Page Output Caching

·         Granular Control over Request Validation

·         New Overloads for "Html.LabelFor" and "Html.LabelForModel"

·         Client-Side Validation Enabled by Default

·         Global Action Filters

·         New "ViewBag" Property

·         Remote Validator

·         JSON Binding Support

·         Sessionless Controller Support

·         JavaScript and Ajax Improvements

·         New "AdditionalMetadataAttribute" Class

·         "DataAnnotations" Metadata Attributes

·         "ValidationAttribute" Class

·         Validation Interfaces

MVC 4

·         Add Controller to other project folder

·         Task Support for Asynchronous Controllers

·         Bundling and Minification

·         Enabling Logins from Facebook and Other Sites Using OAuth and OpenID

·         App_Start folder and separate classes

·         Display Modes

·         Azure SDK

·         Database Migrations

·         ASP.NET Web API

·         Mobile Project Template

·         Empty Project Template

·         Enhancements to Default Project Templates

           MVC 5

·         One ASP.NET

·         Attribute based routing

·         Asp.Net Identity

·         Bootstrap in the MVC template

·         Authentication Filters

·         Filter overrides

MVC 6 

·         ASP.NET MVC and Web API has been merged in to one.

·         Dependency injection is inbuilt and part of MVC.

·         Side by side - deploy the runtime and framework with your application

·         Everything packaged with NuGet, Including the .NET runtime itself.

·         New JSON based project structure.

·         No need to recompile for every change. Just hit save and refresh the browser.

·         Compilation done with the new Roslyn real-time compiler.

·         vNext is Open Source via the .NET Foundation and is taking public contributions.

·         vNext (and Rosyln) also runs on Mono, on both Mac and Linux today.