In case you don't follow the "Beta" releases, I thought I'd let you know that Fedora 12 Beta was just announced. Compared to Fedora 11, this release contains mostly hardware compatibility and virtualization. Check out the Feature List for full details.
I'm pretty excited about Multi-Pointer X. This extension provides a new client API for handling input devices and also Multi-Pointer X (MPX) functionality. MPX functionality allows X to cope with many inputs of arbitrary types simultaneously, a prerequisite for (among others) multitouch-based desktops and multi-user interaction on a single screen.
I am also looking to try out GNOME Shell "preview". Fedora 12 includes an early version of GNOME Shell, which will be the new way to launch applications, access documents, and organize windows in GNOME 3.0 (expected "sometime" in 2010.) I'm interested in GNOME Shell because it seems like a great way to separate the idea of "this is my desktop" from an application launcher. You may, at first, think it's an odd way to launch programs, but check out the Screencasts and you may agree that it makes things a lot easier.
GNOME Shell is still "preview", so not installed by default yet. Install the gnome-shell package, and use the Desktop Effects configuration tool to enable it.