How about the compatibility of Win10 Technology Preview?

Windows10 technology preview version has been officially opened for download at 1 am on October 2, but many users may have the above confusion. How is the compatibility of Win10 technology preview version? Will there be software incompatibility when installing Win10 technology preview? What happened? The Microsoft official also answered this question.

Compatibility
Technology Preview should be for devices and programs that work with Windows 8.1, but some devices and programs may need to be updated or reinstalled.
Windows drivers for basic functions such as storage, networking, input and display. These drivers let you complete Windows installation and connect to the Internet. More drivers are available from Windows Update.
If you use a mouse and keyboard
While there are certain exceptions, your apps and devices should work as expected. We hope to see how you feel about the new Windows mouse and keyboard features and the new yet familiar features it provides for Windows and apps.
If you have a touch computer
You can use the technology preview version with touch, but there are still a lot of rough and imperfect touch operations. More touch-friendly improvements will be added in the future. In the meantime, let us know how you feel about interacting with Windows and apps in the preview.
Note
Some computer processors and hardware configurations are not supported by the Technology Preview.
If Windows 8 Professional comes with Media Center and a preview is installed, Windows Media Center will be removed.
After installing the preview version, you will not be able to play DVDs using Windows Media Player.