Win7 users can upgrade to Win10 Preview through system update?

There are many ways to experience the Win10 Technology Preview, such as downloading the Win10 Technology Preview image and upgrading it directly, or by USB. However, there are now foreign media sources that some Win7 users have received updates to the Win10 Technology Preview via system updates.

At present, it is uncertain whether Microsoft's push to be updated preview version of Win10 to Win7 wide range of users. Now through the system update of Win7, you can directly view the update option of Windows 10 Technology Preview, which can be downloaded and installed directly like the normal system upgrade patch. The system will then automatically upgrade to the Win10 Technology Preview without manual intervention. However, the caveat is that Win7 users need to join the Windows Insider Program and download a small file before they receive the Win10 update.
Microsoft has not released any official announcements or explanations for this update. Of course, this is not the first time Microsoft has done this.