No, new features don't usually get backported to the stable branch.
It will ship with 1.13.9 (mainline) in 6 hours (at the time of writing).
For stable branch, you need to wait until the 1.13 milestone is completed, which according to their roadmap (https://trac.nginx.org/nginx/milestone/1.13) will be completed in 8 weeks.
It will ship with 1.13.9 (mainline) in 6 hours (at the time of writing).
For stable branch, you need to wait until the 1.13 milestone is completed, which according to their roadmap (https://trac.nginx.org/nginx/milestone/1.13) will be completed in 8 weeks.