The Windows 8 blog said: “The most used tool in Windows 8 will be the IE10 browser. IE 10 is available as a Metro style app and as a desktop app. Metro style IE provides all the main navigation keyboard shortcuts and mouse support you’ve come to expect — creating tabs, moving between tabs, entering addresses, searching, and more.”
This will happen for sure, no matter in 2013 or in 2012. Windows 8 will came and we will develop the applications as well as for desktop and for the web. BTW, the desktop app continues to fully support all plug-ins and extensions. And Metro style for the web.
For the web to move forward and for consumers to get the most out of touch-first browsing, the Metro style browser in Windows 8 is as HTML5-only as possible, and plug-in free. The experience that plug-ins provide today is not a good match with Metro style browsing and the modern HTML5 web.