I just did a Google Blog search for "tridentine" and it came back with a hit to the blog of a Lutheran pastor, Paul T. McCain. He has a post about the upcoming motu proprio by the Pope regarding the liberalization of the Old Mass. In his post, among other things, he states that the contents of the document "apparently has already been leaked, in Spanish, in Central America".
My knowledge of Spanish, and my time, being limited here at the office, I have no way of pursuing this. But perhaps some of you can!!!! Keep me posted if you have any success.