From the site Palazzo Apostolico we find this bit. Keep in mind this is consistent with the usual back halls murmuring anytime the main chairs of dicasteries come into play. The following is typical of Roman curial speculation. My translation:
Benedict XVI will have to decide who will go to replace the 75 year old Francis Card. Arize at [the Congregation for] Divine Worship. If the present Secretary of the Congregation, the Sri Lankan [Archbishop] Malcolm Ranjith seem to be the favored candidate – he enjoys the good opinion of the Pope – his acts of spending himself in defense of the Motu Proprio Summorum Pontificum could have crated not a few enemies for him among those monsignors of the Curia who, even today, are close adherents of the dictates of the late Annibale Bugnini, are not look with a favorable eye on a liturgical "reform of the reform".
During my December time in Rome, I had quite a few conversations about the Congregation. I am pleased that there are some personnel developments there which are very encouraging. There are certainly the old guard in the CDW who would just as soon still have a portrait of Paul VI on their office wall, rather than these other Pope’s who have come along. They are senior officials now and have some clout. However, the top positions of the Congregation will be picked by the Holy Father. Archbp. Ranjith is not Secretary by accident. He is the man the Holy Father wanted in that chair. It is unlikely that Pope Benedict will now forget about him.
At the same time, while Card. Arinze is 75 now, and at the age where his mandate comes up for review by the Holy Father for reasons of age, nothing is going to compell the 80 year old Pope to replace Card. Arinze before he is good and ready. Until he does, Card. Arinze is the Prefect of that Congregation and no one else. With Ranjith in the second chair, the Congregation still has a very strong leadership despite the machinations of the aging hippie types whose ranks are also being thinned by the biological solution.