The software developer showed off its ability to handle HTML5 and CSS3, while touting improved performance through multi-threading and GPU accelerated HTML5 rendering. JavaScript also gets a massive boost thanks to multi-core compiling of JavaScript running parallel to the browser.
Now you’re asking yourself, when will this be ready as a real IE9 browser? If they’re sticking to HTML5 compliance, that means we’ll have to wait until the necessary parts of the standard are stable, which may mean late 2010 (see HTML5 Completion on Wikipedia).