A new Nginx version is out and this are the details according to Nginx.org website:
Changes with nginx 1.2.8 *) Bugfix: new sessions were not always stored if the "ssl_session_cache shared" directive was used and there was no free space in shared memory. Thanks to Piotr Sikora. *) Bugfix: responses might hang if subrequests were used and a DNS error happened during subrequest processing. Thanks to Lanshun Zhou. *) Bugfix: in the ngx_http_mp4_module. Thanks to Gernot Vormayr. *) Bugfix: in backend usage accounting.