There has been some confusion as to whether Wix will ship with Visual Studio 2010.  The latest I’ve seen is that it will not ship as part of the product.  However, the good news is that if you go to the Votive website you can already download a weekly build of the Wix Toolset that will register itself with the beta of VS2010.

Whilst the v3.5 toolset will install and register against Visual studio 2008 as well, you will need to update your wix projects to point to the v3.5 targets:

<WixTargetsPath Condition=" ‘$(WixTargetsPath)’ == ” ">$(MSBuildExtensionsPath)\Microsoft\WiX\v3.5\Wix.targets</WixTargetsPath>