The first alpha release of Fedora 13 Goddard was going to be due out next week, but that release is now pushed back by a week. Fedora lives on the bleeding edge of Linux development with many new features going into each release. It gives Linux enthusiasts a taste of what is to come in the other distros.
Red Hat engineers and the Fedora community have been working on fixing some bugs blocking Fedora 13 Alpha and they need additional time to verify the issues as being resolved. As of right now, there is no change in the release schedule of the final release of Fedora 13 that is due out in the middle of May. There is also a beta release still due out at the start of April and a release candidate at the end of April.