Thanks be to God!
Summary of the Twelve Articles of Summorum Pontificum
The Roman Missal promulgated by Paul VI (Novus Ordo) is the ordinary form to be used for the liturgy while the Missal promulgated by Pius XII and then by Bl. John XXIII (Missal of 1962) is the extraordinary form.
The 1962 Missal was never outlawed. (Few people know this, that's why I put it in bold.)
In Masses without the people, priests can use the 1962 Missal except during the Triduum.
Communities or Institutes of Consecrated Life or Societies of Apostolic Life can use the 1962 Missal.
The faithful who wish to attend the Masses mentioned in Art. 2 can do so with permission.
Where a group desiring the celebration of the Mass according to the 1962 Missal stably exists in a parish, let the pastor accede to their requests willingly. There may only be one such celebration on Sundays and feast days.
In Masses according to the Missal of Bl. John XXIII the readings can be proclaimed in the vernacular.
If the faithful cannot obtain the celebration of the Mass according to the 1962 Missal from their pastor, let them go to their Bishop, if he cannot accommodate them, let them go to the Ecclesia Dei Commission.
If a Bishop wishes to grant a request for the use of the old Missal and is somehow prohibited, let him go to the Ecclesia Dei Commission for advice and help.
Pastors are allowed to celebrate the sacraments of Baptism, Matrimony, Penance, the Anointing of the Sick and Confirmation according to the 1962 Missal as the good of souls may suggest. Priests can also pray using the Roman Breviary of Bl. John XXIII.Bishops can erect a personal parish for the celebration of the Roman rite according to the older forms.
The Ecclesia Dei Commission is to have the form, duties and norm for action that the Roman Pontiff may wish to assign to it.
The Ecclesia Dei Commission will exercise the authority of the Holy See by maintaining vigilance over the observance and application of these dispositions.
Whatever is decreed by Us by means of this Motu Proprio, we order to be firm and ratified and to be observed as of 14 September this year, the feast of the Exaltation of the Holy Cross, all things to the contrary notwithstanding.
Lots more articles pertaining to the motu proprio here:
http://www.catholicnewsagency.com