Microsoft will be pushing out an update to Internet Explorer 10 tomorrow that will enable Flash support for both Windows 8 and Windows RT. At the moment, the "full web" experience has been a bit held back on the desktop browser.
This was a move made by Microsoft to improve performance, battery life and touch experience. The update will see Internet Explorer 10 for Windows 8 & RT users able to access Flash content on most - but not all - websites. Some websites have been blacklisted by the Redmond-based giant due to their negative impact on the user experience.
Desktop-based IE10 users will be alright, with access to all Flash-enabled content.