Microsoft posted the first (public) updates for Windows 8:
An update is available to correct tile logo images of files on the All Apps View.
Assume that you add the shortcut for a file to the All Apps View in Windows 8, Windows RT or Windows Server 2012. After you change the file association of the file type, the tile logo image is not updated accordingly in the All Apps View.
Also Microsoft published the EU browser choice Screen update for Windows 8.
Both updates are available through Microsoft Update app.