fedora 20 发布周期确定：内容如下
2013-07-02 Fedora 19 Release
2013-07-16 Change Proposals Submission Deadline
2013-08-20 Changes Freeze--Planning & Development Ends
Branch Fedora 20 from Rawhide
2013-09-03 Software String Freeze
Alpha Change Deadline
2013-09-17 Alpha Release
2013-10-08 Software Translation Deadline
Beta Change Deadline
Accepted Changes 100% Complete
2013-10-22 Beta Release
2013-11-12 Final Change Deadline
2013-11-26 Fedora 20 Final Release
其中值得注意的是9-17的Alpha版本发布，10-22的Beta发布还有11-26的最终发布，当然，不排除最终发布例行跳票的可能～～～～不过想尝鲜的可以准备好安装alpha版本了哦～～～～