A handful of scans from the German gaming magazine PC Action seem to confirm that the previously rumored PC release for Dark Souls will be coming in August 2012. Assuming that the information is accurate, the Dark Souls: Prepare To Die edition will add a number of new bosses to the game.
A NeoGAF post reveals that the new bosses are pretty much the extent of the changes made to the console release. Two of these new boss names are revealed as well -- Guardian of the Tomb and Black Dragon -- though it's not clear if they are the extent of the new content. Japanese website Jin also shares a few scans from the magazine (via Polygon) that offers looks at these two bosses, one of which you can see above.