It seems still to be a matter of rumour, but here (click) is a report in the Hamburger Abendblatt. Castorf is Intendant at Berlin's Volksbühne. I have not seen any of his productions, and should be very interested to hear from those who have, but from what I have gleaned concerning his politico-æsthetic stance - a 1990 post-GDR Die Räuber onwards - and his rejection of linear narrative, it sounds as though he may turn out to be an interesting choice. Stefan Herheim should still have been asked though...
(Click here for the results of the readers' poll on who should direct the 2013 Ring.)