Visual Studio 2013 Preview, Visual Studio 2012 Update 3 and .NET Framework 4.5.1 are available for download

You can download the following versions of Visual Studio 2013 Preview

Visual Studio 2013 Preview
Visual Studio Ultimate 2013 Preview
Visual Studio Premium 2013 Preview
Visual Studio Professional 2013 Preview
Visual Studio Test Professional 2013 Preview
Team Foundation Server 2013 Preview

Visual Studio Express 2013 Preview
Visual Studio Express 2013 Preview for Web
Visual Studio Express 2013 Preview for Windows
Visual Studio Express 2013 Preview for Windows Desktop
Visual Studio Team Foundation Server Express 2013 Preview

There is also some additional software available

Additional software
Team Explorer
Team Explorer Everywhere for TFS
.NET Framework 4.5.1
Agents for Visual Studio 2013
IntelliTrace Collector for Visual Studio
Feedback Client for TFS
Remote Tools for Visual Studio 2013
Visual C++ Redistributable for Visual Studio 2013
Visual Studio Shell
Visual Studio SDK
Multibyte MFC Library for Visual Studio 2013 Preview
Modeling SDK for Microsoft Visual Studio 2013 Preview
Microsoft Build Tools Preview

You can download all the versions of Visual Studio 2013 Preview here http://www.microsoft.com/visualstudio/eng/2013-downloads

Visual Studio 2012 Update 3

You can download Visual Studio 2012 Update 3 here http://www.microsoft.com/en-us/download/details.aspx?id=39305