"Romanitas," just as it sounds, refers to a certain "Romanness" which could be pre-Christian or Christian. "Collegiality" refers to group consultation and decision-making; think of a synod that discusses and sets goals.
In this time of overdue reform in the Catholic Church, Pope Francis has already taken the collegial or synodal turn: he has established a council of eight cardinal-advisors and is gearing up for a series of meetings and an extraordinary synod to discuss pressing challenges.
I found it of interest that such collegiality is very, very anciently Roman:
"the business of the gods was very serious, and the collegiate mentality of the Romans abhorred a single individual with the sole authority to mediate an important relationship."
David Potter, Ancient Rome: A New History (2009), p. 38.
More heads are better than one. It's common sense with an ancient pedigree--a pedigree very fitting for the see of Rome.
(Image of reconstructed Roman Senate/Curia Julia under GNU Free Documentation License, Wikimedia Commons)