Kernel release status
The current development kernel is 4.4-rc8, released on January 3.
"
Normally, me doing an eighth release candidate means that there is some unresolved issue that still needs more time to get fixed. This time around, it just means that I want to make sure that everybody is back from the holidays and there isn't anything pending, and that people have time to get their merge window pull requests all lined up. No excuses about how you didn't have time to get things done by the time the merge window opened, now."
Previously, 4.4-rc7 came out on December 27.
Stable releases: none have been released since December 14.