If you want to know more about the technical details of the IE10 Platform Preview then take a look at this great documentation I just stumbled upon. It outlines all the new features that have been added.

  • Cascading Style Sheets Level 3 (CSS3) support
    • Flexible Box (“Flexbox”) Layout
    • Grid Alignment
    • Multi-column Layout
    • Gradients (on background images)
  • ECMAScript 5 (ES5) support
    • The strict variant of ECMAScript (“ES5 strict mode”)

Also for those that are interested in site pinning and Jump lists in IE9, we just updated the documentation based upon feedback from developers.