For those interested in helping out in this latest test day, visit the Fedora Project Wiki for details in full. Specially crafted Fedora KDE ISOs are also available for easy testing from a live environment.
These Fedora Test Days are useful (and worth promoting) even if you're not a Fedora Linux user because the improvements and fixes made that come as a result of this organized testing end up being pushed back upstream to benefit other distributions too.
Among the Fedora KDE use-cases to test out are the desktop effects, session management, window manager interactions, applets/Plasmoids, Bluetooth, KScreen, and other hardware integration support within the KDE desktop environment.
While it's been plagued by delays, it looks like Fedora 20 "Heisenbug" final will arrive around mid-December.