Since 30 January 2013 new version of Inno Setup – 5.5.3 – is available. All details are here:
The most important thing is that Inno Setup seems to be fully compatible now with Windows 8 and Windows Server 2012 with all the changes made in 5.5.2 and 5.5.3.
Let's talk about the flag excludefromshowinnewinstall, it is used in [Icons] section and has no impact on systems earlier than Windows 7. Concerning Windows 7 and Windows 8, this flag has a different effect. On Windows 7 the flag prevents entry from receiving highlight after installation in Start menu. As for Windows 8 the flag prevents entry from being pinned to the Start screen.
Also new version of Inno Setup includes changes in Restart Manager, new translations, new command line parameters and other minor things.