Happening on Thursday, 15 March, is a test-day surrounding the GNOME Shell and its extensions for the GNOME 3.x desktop. The Fedora camp is looking for people to try out the latest GNOME Shell and to then play around with the many GNOME extensions.
Even if you're not an ardent Fedora user, it's recommended to participate in their test days if you're interested in the project being tested. Unlike other distributions, the Fedora / Red Hat developers actively work towards pushing their changes back upstream, etc.
The state of the Fedora packages being tested are also the very latest. Updated Fedora 17 i686 / x86_64 images have been spun for this GNOME Shell testing to make the process quick and easy for anyone to get involved. This test day is similar to their well known Fedora graphics test days. Fedora 17 is using the GNOME 3.4 packages as their default desktop experience.
For those interested or to learn more information, visit this Fedora Project Wiki page.
Meanwhile, next week is the deadline for features to be 100% complete for the feature-rich Fedora 17. The beta of Fedora 17 "Beefy Miracle" is expected to come early next month as an appetizer while the final release is on the menu for May.