What's new in visual studio 2013

ASP.NET Identity
- Claims-based authentication
- OAuth 2.0
- Integration with Windows Azure Active Directory and Windows Server Active Directory
ASP.NET Web Forms
- One ASP.NET
- ASP.NET Identity
- ASP.NET Scaffolding
- Bootstrap
ASP.NET MVC 5
- One ASP.NET
- ASP.NET Identity
- Bootstrap
- Authentication filters
- Filter overrides
ASP.NET Web API 2
- Attribute routing
- OData improvements: $select, $expand, $batch, $value and improved extensibility
- Request batching
- Portable ASP.NET Web API Client
- Improved testability
- IHttpActionResult
- CORS
- Authentication filters
- Filter overrides
- OWIN support and integration
Scaffolding
ASP.NET SignalR
- iOS and Android support via MonoTouch and MonoDroid (Xamarin)
- Portable .NET Client Library
- Self-hosting package
- Backwards compatible server support
- .NET 4.5 only (Server Side)
- Removal of Assemblies/APIs
- Migrating your application from 1.x to 2.0
- IRequest.GetHttpContext() replacement
- Server sent events has known issues on Silverlight
- Bug fixes
Katana
- Entity Framework
- ASP.NET Web Optimization 1.1.0
Known Issues and Breaking Changes
- Installation Issues
- General Issues
- Tooling Issues
- ASP.NET MVC Issues
- ASP.NET Web API Issues
- Templates
- ASP.NET SignalR Issues
- Entity Framework 6
- Web Forms Scaffolding
- MVC Scaffolding

Peek Definition. (Alt + F12) You can browse through Visual Basic, C#, and C++ code definitions without opening a new document tab.
Enhanced Scroll Bar. You can set the scroll bar to indicate code markers such as errors, warnings, changes, and breakpoints.
Navigate To. (Ctrl+,) : improvements include live result previewing and a streamlined inline UI experience.
Auto Brace Complete The Auto brace complete feature automatically adds closing parenthesis, quotes, braces and brackets for you as you type code in the Editor. This was one of the popular Productivity Power Tools Features that we decided to include in the Visual Studio 2013.
Move Line Up/ Down (Alt Arrow-Up/ Arrow-Down) Other new features include the ability to move a line or selection up or down by using hotkeys and auto brace completion.
New IDE Features for JavaScript when you select an identifier, such as a variable name or function call, references to it are highlighted in the current source file. Also added a new navigation bar that appears at the top of the editor window so you can more easily move through the primary functions and objects in your JavaScript source.