The Evaluation version of Windows Embedded Standard 7 (componentized, embedded version of Windows 7) is available for download on Microsoft download center.
Anyone can download it and cook its own (time bombed) OS image for its device. Let me know what you have in mind!
To learn more about the tools and the technology, visit this site.
Some OEMs already started developing their products on the CTP and are ready to deliver on this platform. Check this video out: