Apparently Steve Ballmer has publicly stated that Microsoft plans to look into Webkit... that's news to me! Microsoft's browser needs to support modern web standards: HTML4, XHTML, CSS, SVG and as much HTML5 as is ready for deployment.
But Microsoft has also publicly been "looking into" SVG for years and years, so I'm not going to hold my breath.
These days, Internet Explorer is the last browser I look at... as long as all my textual content is actually visible, then that's just fine by me.