The new Catalyst 8.12 drivers have been leaked and you can download them here:

http://www.mediafire.com/?h1ytmgy40w3

http://www.mediafire.com/?h1ytmgy40w3

Also read:

Catalyst 8.12 performance gains revealed

Update:

Apparently, we have to thank the guys from Ati-forum.de for this leak, but unfortunately, the last time we checked, the link to the news post was down. On the other hand, the download links are working just fine.