Windows 10 Build 10147 has just leaked onto the internet. The build is available as an ISO from a Chinese website and it isn’t known what’s new on the build just yet. You can download the build
from this page (in chinese) – using the security code
62na. However, as usual, we won’t recommend installing the build as it isn’t an official release.
UPDATE: The ISO is now available on Google Drive which offers a much faster download speed. You can
get it from here.
▼ This is what you will get from Google Drive, but be patient and keep trying. ▼
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source:microsoft-news

Reports this version requires an installation key, and the key below does not work.
6P99N-YF42M-TPGBG-9VMJP-YKHCFAnother report indicates Windows 7/8.1 key could activate this version.
Since the activation key has been changed and another is required could mean MS is getting ready for GA!