I'm a huge fan of IE 9. I predicted many months ago that it was going to be a killer release for Web standards and that's definitely happening. But WTF, Microsoft? Are you trying to add more confusion to the conversation?
Platform Preview 6 introduces two new major HTML5 features along with bug fixes and performance enhancements made since the release of Platform Preview 5 and the Internet Explorer 9 Beta. The HTML5 features include CSS3 2D Transforms, which provide a simple, declarative way to translate, rotate, and scale elements in two-dimensional space.(emphasis mine)
HTML5 features include CSS3? That's seriously confused. Please stop this. HTML5 is HTML. CSS3 is CSS. They two are not the same thing.