Uploaded today was Fedora 20 Alpha Release Candidate 1 and it's encouraged for testing and to share your results with Fedora developers in ensuring Fedora 20 Alpha is ready for debut next week.
Fedora 20 Alpha RC1 is available in the usual flavors including Fedora Live for both GNOME and KDE. There's also test spins available for Fedora on MATE with Compiz, SoaS, Xfce, LXDE, Games, and Fedora Live Design Suite. Download links for ISOs are available from this directory.
Among the features of Fedora 20 "Heisenbug" include serving it as a Wayland Technology Preview, new GNOME 3.10 packages, Virt Manager improvements, no default sendmail or syslog, and a lot of other original features.