After seeing the TAILS 2.12 release notes about TorBrowser 6.5.2, I did some quick digging.
Although it doesn't seem to be available as an automatic update in TorBrowser yet (Help -> About), it is built and out on every platform:
https://dist.torproject.org/torbrowser/6.5.2/
When it's official the website will be updated:
https://www.torproject.org/download/download-easy.html.en
//edit: It's out now on the browser as /u/JoblesJoe said.
Changelog:
Tor Browser 6.5.2 -- April 19 2017
All Platforms
- Update Firefox to 45.9.0esr
- Update HTTPS-Everywhere to 5.2.14
- Update NoScript to 5.0.2
- Bug 21555+16450: Don't remove Authorization header on subdomains (e.g. Twitter)
- Bug 19316: Make sure our Windows updates can deal with the SSE2 requirement
- Bug 21917: Add new obfs4 bridges
- Bug 21918: Move meek-amazon to d2cly7j4zqgua7.cloudfront.net backend
Windows
- Bug 21795: Fix Tor Browser crashing on github.com
New 9000 released.....Smokes ten times the meth as older version......Bahahahaaaaaaa!!!!!