National Catholic Reporter is reporting (as is their wont) that a top Vatican official, Darío Cardinal Castrillón Hoyos, President of the Ecclesia Dei Commission, has confirmed that Pope Benedict XVI "intends to extend to the entire church the possibility of celebrating the Mass and the sacraments according to the liturgical books promulgated by Pope John XXIII in 1962."
Tomorrow is the birthday of Pope John Paul II († 2005); perhaps tomorrow the Motu Proprio will be announced?
For more information, see What Does The Prayer Really Say? by Fr. John Zuhlsdorf.
Update (2007-05-20): this is why I'm not a prognosticator.