This from the Academy of Motion Picture Arts and Sciences late last night:
Academy of Motion Picture Arts and Sciences President Tom Sherak announced that Eddie Murphy has withdrawn as host of the 84th Academy Awards. "I appreciate how Eddie feels about losing his creative partner, Brett Ratner, and we all wish him well," said Sherak.
Commented Murphy, "First and foremost, I want to say that I completely understand and support each party's decision with regard to a change of producers for this year's Academy Awards ceremony. I was truly looking forward to being a part of the show that our production team and writers were just starting to develop, but I'm sure that the new production team and host will do an equally great job."
See previous post(s) about Ratner's replacement Brian Grazer, and more about the Oscar Awards Gala in February. No replacement has been announced for Murphy at this posting.