You can read the official Bollettino here. Details are scant.
Marini's reputation in circles as a nefarious disciple of the insidious Archbishop Bugnini is a bit much. He did solid work during the transition from John Paul II to Benedict XVI. One can disagree with his interpretations and theory, however, he knows the history of the Latin liturgy and has a vested interest in it.
This having been noted, the placement is a bit of a puzzle - Marini's knowledge and experience of the Eastern liturgies is a bit of an unknown. This being said, I don't believe he is the type that would try to impose any Latinizations (whatever the term would mean these days).