With the resignation of Pope Benedict XVI, most of the high Curial offices were declared vacant - including that of the Prefect. The new Pope is able to make new appointments or confirm the previous office holders in their role. The rapid re-establishment of Gerhard Ludwig Müller is considered a vote of confidence in the former Bishop of Regensburg. Like the present Pope in his time as a Cardinal of Buenos Aires, Müller in Latin America - has been active on behalf of the poor - especially in Peru. Together with the "father of liberation theology", Gustavo Gutierrez, he has written the book "On the side of the poor."
Cathcon- not clear from the article whether the Head of the CDF is confirmed for the long term, as all the Curial offices have (finally) been confirmed pro forma. This normally follows within 24 hours of the new Pope being elected.
Pope Francis has been no friend to the liberation theology which Archbishop Müller so ardently espouses. An indication of his attitude to the Head of the CDF will be whether the overdue red hat follows at the first opportunity.