Update: These instructions also apply to the RTM version of VS.

This seems to be one of the questions I am seeing most on twitter (@DougWare) so even though this information will probably be easy to find very soon as the developer center content appears, I thought I'd post what I did for those of you who just can't wait.

Thanks to @robwindsor for helping me get started by pointing me to this page: http://msdn.microsoft.com/en-us/library/office/apps/ee554869(v=office.15). It has a section on this subject:

The problem is that I couldn't find the link to which this refers. So, to get this working follow these steps. Note that these instructions are for On Premises development and you don't strictly require a SharePoint installation if you want to develop using the new Apps model.

1. Setup SharePoint 2013 Preview
2. Install Visual Studio 2012 RC
3. Download and install the Web Platform Installer 4.0 RC http://www.microsoft.com/web/downloads/platform.aspx
4. Launch the Web Platform Installer and search for Office
5. Install Microsoft Office Developer Tools for Visual Studio 2012 RC – Preview (it installs the others you see in the screen shot)
   
   
   
6. Download and install the SharePoint Server 2013 Client Components SDK from here http://www.microsoft.com/en-us/download/details.aspx?id=30355 (Note it doesn't have any documentation or samples in it as of this writing)
7. Launch VS 2012 and have fun!
   
   

--Doug

Author: Doug Ware