As promised, we have pushed FC6 prerelease images to the trackers:
http://torrent.fedoraproject.org/

The following install-blocking bugs have been tested and should be fixed in these images:
#206876: GRUB claims initrd is too big for memory on x86_64
#206453: installed x86_64/ppc system missing initrd, cannot boot
#206202: Anaconda traceback during lvcreate on ppc64
#206913: Anaconda exception on upgrade from FC5
#208080: ahci/ata_piix mixup causes Anaconda to not find SATA disks
This is not a complete list of bugs fixed, just some of the most troublesome installer bugs from Test3.

There *is* a known bug when trying to install using Fedora Extras in this release. Luckily we already have a fix for it that you can use with these images! Just follow the directions here:
http://fedoraproject.org/wiki/Anaconda/Updates

You can get the update image from here:
http://people.redhat.com/~katzj/updates-fc6pre.img

This will also help us test the Anaconda Update code, so if you're thinking of using Extras, please give it a shot!

Another note: the keyboard won't work in firstboot. The mouse is fine, though, so you can click your way through. I believe we already have a fix for this, but it just didn't make it in time for this release.

Enjoy the updated images, and happy testing. Be sure to keep your newly-installed FC6pre systems up to date and keep on testing as we make the final push towards the release of FC6!

-w