The Windows Installer XML (WiX) team has released version 3.6 which, most notably, released a powerful and customizable chainer named Burn. The Visual Studio 2012 setup applications weren’t built on Burn using features such as package caching, reference counting, and sticky patching to improve the overall experience from past releases.
Head on over to Rob’s blog post for more information about all the features introduced and improved in WiX v3.6 as well as background information on how we achieved such an important release for WiX.