Microsoft has made Windows 8 Developer Preview availible for download. You can get the 32 and 64 bit version both with or without the developer tools, which consists of:

  • Windows SDK for Metro style apps
  • Microsoft Visual Studio 11 Express for Windows Developer Preview
  • Microsoft Expression Blend 5 Developer Preview
  • 28 Metro style apps including the BUILD Conference app

You can download it here: http://msdn.microsoft.com/en-us/windows/apps/br229516

You can watch the keynote from the BUILD conference, which was solely concentrated on Windows 8:

http://www.buildwindows.com/