From the webpage:
Tor 0.2.8.6 has been released! You can download the source from the Tor website. Packages should be available over the next week or so.
Tor 0.2.8.6 is the first stable version of the Tor 0.2.8 series.
The Tor 0.2.8 series improves client bootstrapping performance, completes the authority-side implementation of improved identity keys for relays, and includes numerous bugfixes and performance improvements throughout the program. This release continues to improve the coverage of Tor’s test suite.
Below is a list of the changes since Tor 0.2.7. For a list of only the changes that are new since 0.2.8.5-rc, please see the ChangeLog file.
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Government agencies are upgrading and so should you.