Internet Explorer 9 may get a beta release with a heavy HTML5 emphasis at Microsoft's MIX 2010 developer conference in mid-March, according to escaped details. Hinting that IE9 will have comprehensive support for HTML5 is a scheduled briefing at MIX 2010 titled "HTML5 Now: The Future of Web Markup Today." Opera Software’s Molly Holzschlag will present the party and has said to expect Microsoft to bring browser storage and other HTML5 features.
Another session will focus on scalable vector graphics (SVG), a technology supported by most other browsers and especially those that recognize HTML5. IE Senior Program Manager Patrick Dengler will be the head speaker at the talk, known as "Future of Vector Graphics for the Web."

Currently, IE8 gets HTML5 capabilities like plugin-free video playback and SVG only thanks to add-on features from third parties. Google's Chrome Frame is the most conspicuous example and inserts the web engine from Chrome on top of Microsoft's browser.

via: http://www.electronista.com/articles/10/03/04/ie9.to.be.more.modern.with.html5.support.more/