Reliable sources close to the Holy See have indicated that sometime in the second half of 2018, the Novus Ordo Lectionary and Calendar are to be imposed upon the Extraordinary Form of the Roman Mass.
The new Roman Missal will become available on the First Sunday of Advent 2018 but the Vatican will allow a two-year period to phase it in. These changes are expected to be much more drastic than what was envisaged in Universae Ecclesiae that states:
25. New saints and certain of the new prefaces can and ought to be inserted into the 1962 Missal, according to provisions which will be indicated subsequently. (emphasis ours)
The Vatican approved societies and institutes, such as the Fraternity of Saint Peter and the Institute of Christ the King, will likely apply for exemptions, but all requests are expected to be turned down. The only exception seems to be the SSPX, which might be granted a temporary exemption, to ensure that an agreement is reached between the SSPX and Rome. However, if the exemption granted will be of a temporary nature, more SSPX priests are expected to join the so-called Resistance (formerly known as SSPX-SO) under Bishop Richard Williamson and more will go independent.This would make the traditional Catholic movement more fragmented than ever before.