Microsoft today demonstrated an early, three week old, build of Internet Explorer 9 at Microsoft's Professional Developers Conference 2009. Neowin report IE 9 will take advantage of the power of the GPU for all page rendering and developers can exploit this using CSS, DHTML and javascript. In just three weeks Microsoft believes performance has increased for IE9 resulting in smoother rendering and improved performance. Interoperability and standards support is increasing and features such as rounded corner CSS support will be built in. A new JS engine will also be built into Internet Explorer 9. Microsoft offered no time lines or indications as to when a build of Internet Explorer 9 will be available publicly. Steven Sinofsky, President, Windows and Windows Live Division, mentioned that Microsoft had only begun working on Internet Explorer 9 three weeks ago, according to our sources the latest internal build is labelled 7658.0.091116-1745.
Because people dont want to wait 4 years for a new IE, otherwise Firefox / Chrome would destroy them with upgrades and features.