According to Dan Rafael, Alexander Povetkin injured his left foot after tripping on a tree root. Rafael goes on to say that Wladimir Klitschko will still fight on Dec. 13 with Cristobal Arreola as one of the leading candidates. Arreola would have to ditch his B.A.D. fight in order to get destroyed by Klitschko. Other possible candidates include Alexander Dimitrenko, Oleg Maskaev, and Hasim Rahman.
Addition by SC:
That's too bad, but, well, whatever. Klitschko-Povetkin will happen sometime in 2009, I'm sure. As much as I like Chris Arreola, I hope he's smart enough to say, "You know what? Not yet." Dimitrenko, at 6'7", seems like the most interesting idea of the names mentioned, at least to me.