The Motu Proprio has indeed been published, and it contains all that traditionalists had hoped for. Here is a summary.
When saying a private Masses, priests will be free to choose between the "ordinary form" (novus ordo) and the "extraordinary form" (Tridentine) without reference to their bishop.
In a parish, the extraordinary form (Tridentine) may be used if there is a stable group that requests it.
There is provision for "personal parishes", using the traditional rites, to be set up at the discretion of the bishop.
The above applies to weddings, funerals, pilgrimages etc.
The implementation date is 14th September. Feast of the Exultation of the Holy Cross.
For the full text, see Vatican website or Rorate Caeil website.