IVSTVS VT PALMA FLOREBIT
Cardinal Francesco Coccopalmerio: He
will remain in being addressed as His Holiness Benedict XVI. Will be the Bishop-Emeritus of Rome
H.E. Cardinal Francesco Coccopalmerio
"He will not return to the cardinalatial dignity, his title will be His Holiness Benedict XVI."
In analogy with what happens in the case of the other bishops on finishing their episcopal ministry they are called bishops-emeriti, therefore I think we can say that on resigning, the Pope is in turn called as the Bishop-Emeritus of Rome. "