Over at Wha t Does the Prayer Really say blog Fr. Z has the scoop that the Latin American Bishops have accepted the idea of the impending Motu Proprio. the story can be found Here.
Also, I have heard a very un-confirmed report, or rumor may be more appropriate, that the Vatican has sent the Motu Proprio to all the Bishops of the world in it's Latin form with some kind of cover letter. Again, this is not confirmed by any news source that I am aware of. Take it as you wish.