Finally some good news for Windows 8 and Windows RT owners. Microsoft will be releasing an update for Internet Explorer 10 tomorrow, this update would enable Flash contents. Users will be able to get the update via Windows Update. Some sites are blacklisted by Microsoft because of their incompatibility with the Windows experience, and reliance on other plug-ins that are not available on Windows 8. Let us know when you get your update or remind your friends to update theirs.
See source for more information.
Source: MSDN Blog