1.Bundling and minifications 2.Web API 3.Mobile Application support and mobile application template.

http://www.asp.net/mvc/tutorials/hands-on-labs/whats-new-in-aspnet-mvc-4

1-Chart, WebGrid, Crypto,WebImage, WebMail Controls All these are available in MVC3 and in MVC4. 2-TempData, ViewData ,ViewBag are available in MVC4. 3-MVC4 provides better support for Jquery like Jquery Mobile.

1.Bundling and minifications 2.Web API 3.Mobile Application support and mobile application template.

1.Bundling and minifications 2.Web API 3.Mobile Application support and mobile application template.

1.Bundling and minifications 2.Web API 3.Mobile Application support and mobile application template.

1. Display Model. 2. Web API. 3. Mobile Application Template. 4.Using Asynchronous Controllers etchttp://www.asp.net/mvc/tutorials/hands-on-labs/whats-new-in-aspnet-mvc-4