From Father Z:
The general publication is 7 July. Review the FIVE RULES.
Also, according to Fr. Z:
On Wednesday afternoon the Secretary of State, Tarcisio Card. Bertone gave the Motu Proprio to 30 bishops from around the world on Wednesday afternoon in the Apostolic Palace. The bishops were explicitly chosen and invited for this. (I am guessing that they were heads of Bishops Conferences.)
To achieve a successful Motu Mania, one must do only three things:
2) Pray, and finally