This IE10 preview adds even more support for HTML5 technologies, enabling richer Web applications with significantly improved performance. IE10’s hardware acceleration of technologies like SVG, CSS3 transforms and animations delivers faster rendering than other browsers.
Features of IE10 PP4 :-
Cross-Origin Resource Sharing (CORS) for safe use of XMLHttpRequest across domains.
File API Writer support for blobBuilder allowing manipulation of large binary objects in script in the browser.
CSS user-select property to control how end-users select elements in a Web page or application.
Support for HTML5 video text captioning, including time-code, placement, and captioning file formats.