I found this speculation on Paolo Rodari's blog, Palazzo Apostolico, which I thought you might find interesting. Any errors in translation are entirely mine.
‘I read the following from the blog of the former Vatican correspondent of La Stampa, Marco Tosatti:
“The replacement of Cardinal Kasper, who is in charge of the dialogue with other Christians and with the Jews, is imminent. There is talk of the man in charge of the Diocese of Regensburg [Ratisbone], Mueller, as his successor.
“According to leaks from a reliable source, at Easter or thereabouts Cardinal Giovanni Battista Re, the head of the important Congregation for the Bishops, should also be leaving his post. The talk is of the Nuncio in Italy, Bertello, or of the Archbishop of Sydney, Cardinal George Pell (who is at present in Rome to see the Pope) as probable candidates.
“Pell is also a possible successor (if the Pope has to make different choices regarding the bishops) to take over the post of Ivan Dias, the head of Propaganda Fide, who could leave before the completion of his 75th year (which falls due in 2011) for serious health reasons.
Finally, after the summer the replacement should be due of the Brazilian Hummes (Congregation for the Clergy) and Cardinal Rodé, the head of the Congregation for Religious.”
Read Tosatti’s entire article here, on his blog San Pietro e Dintorni.'