最新稳定版Folsom修改了一些bug（51个），API未有改变，修复的bug列表：

  https://launchpad.net/nova/folsom/2012.2.3
  https://launchpad.net/glance/folsom/2012.2.3
  https://launchpad.net/keystone/folsom/2012.2.3
  https://launchpad.net/cinder/folsom/2012.2.3
  https://launchpad.net/quantum/folsom/2012.2.3
  https://launchpad.net/horizon/folsom/2012.2.3

解决的安全问题：
Nova: OSSA-2013-001/CVE-2013-0208 - Boot from volume allows access to random volumes
Glance：OSSA-2013-002/CVE-2013-0212 - Backend password leak in Glance error message

感谢OpenStack中国用户组的Ben整理的这些。

发行说明：http://wiki.openstack.org/ReleaseNotes/2012.2.3