Fedora does run the latest kernel RC from its rawhide development. Stable release does run newer version which allow running newer hardware as well.
I always thought it would be a neat exercise to release a gentoo-derived distribution to close the gap. It would be bare-bones and feature daily builds of the latest kernel RC, Mesa git, etc. Release it as a raw disk image for USB sticks so that anyone could simply download and run "today's linux", so that they could see what to expect out of the next major Ubuntu/FC/Deb release.