Flexera released InstallShield 2012 today.
Among other new features is a Suite installation project type. This allows you to package multiple EXE, MSP, MSM files into a single installation. It also allows you to make 1 installer for both 32-bit and 64-bit installations. Prior to this new version, and much to the chagrin of installation developers, you had to do it with 2 installers (2 files).
I will be posting more info soon about this new version.