Yesterday Microsoft made its second preview build of Internet Explorer 10, which is available to testers for download. Microsoft officials have confirmed that IE 10 Platform Preview 2, the same HTML5 engine seen in the recent public ‘Windows 8’, is now available for download. Microsoft is working on the “Trident” rendering engine in IE 10 with Windows 8. Additionally, Microsoft will expect developers to use HTML5, JavaScript and CSS to build new immersive applications for Windows 8. Moreover, Microsoft officials expect new test builds of IE 10 every three months.
Source: http://www.zdnet.com/blog/microsoft/microsoft-delivers-ie-10-preview-2-to-testers/9877#comments