ASP.NET MVC Evolution

MVC1	Basic version introduced by Microsoft
MVC2	Strongly typed html helpers Attribute based model validation scaffolding with customizable templates Fine-tune API and features
MVC3	Razor view engine Support for Multiple View Engines Support Data Annotations Model Validation Improvements Dependency Injection Improvements Global Action Filters New "ViewBag" Property Powerful hooks with Dependency Injection and Global Action Filters Rich JavaScript support with unobtrusive JavaScript, jQuery Validation, and JSON binding HTML 5 enabled project templates
MVC4	WebAPI Default project template Mobile project template (JQuery Mobile) Display Modes Task Support for Asynchronous Controllers Enhanced support for asynchronous methods Model binding Bundling and Minification Add Controller to any project folder release notes
MVC5	One ASP.NET ASP.NET Identity Bootstrap Authentication filters Filter overrides Attribute routing Concurrent Development Interface based architecture
MVC5.1.2	Attribute routing improvements Bootstrap support for editor templates Enum support in views Unobtrusive validation for MinLength/MaxLength Attributes Supporting the ‘this’ context in Unobtrusive Ajax
MVC5.2.2	Attribute routing improvements
MVC6 (Part of ASP.NET vNext) - (Not released yet...)	vNext = MVC, Web API, WebPage and SignalLr peices ASP.NET vNext uses the Roslyn Compiler Supports OWIN Run on hosts other than IIS Dependency injection Using the IServiceProvider interface we can easily add our own dependency injection container) Startup.cs instead of Global.asax Tag Helpers enable server-side code to participate in creating and rendering HTML elements in Razor files.