Nginx 1.8.0 stable has been released
nginx.org
nginx.org
At least, that's what I gather from the new config options they linked to (the relevant options are the proxy_ssl_* directives).
Mainline has newer features, but isn't quite a nightly build. Stable has fewer features but is more stable. I use mainline for my needs, including in production.
[1] explains which version should you use. (I probably go with mainline).
All the newest features are added to mainline releases. By the time most of the bugs are fixed, their version is renumbered and branch is forked to make a stable release.
[2] is where you see the information about upcoming nginx releases.
[1] http://nginx.com/blog/nginx-1-6-1-7-released/ [2] http://trac.nginx.org/nginx/roadmap
Here's the diff between 1.8.0 and 1.7.12
http://trac.nginx.org/nginx/changeset/01d52c2b460da263fd1557...
Tired of being a beta tester.
But nice feature list.
If it were versioned 1.8.1 it'd be a mainline release which is more experimental.