Kernel release status
The current development kernel is 4.12-rc1, released on May 13. Linus said:
Despite it being fairly large, it has (so far) been pretty smooth. I
don't think I personally saw any breakage at all, which is always
nice. Usually I end up having something break, or trigger some silly
build failure that really should have been noticed before it even got
to me, but so far things are looking good.
Famous last words.
Stable updates:
4.11.1,
4.10.16,
4.9.28, and
4.4.68 were all released on May 14;
3.18.53 followed on May 16.