If Arinze is chosen, he might use a name of an earlier African pope, or the name of an important African saint who wasn't pope, like Augustinus, Athanasius, or Cyprianus (bishop of Carthage, martyred in 258). Cyrillus is another name with African associations--St. Cyril of Alexandria was a major figure in the fifth century (and "pope" in the sense of Patriarch of Alexandria, since that title is given to the current Coptic patriarch).
"That church off to the side looks awfully 20th-century to me..."
Yes, extremely, now that you point it out. And that expression, I doubt anyone ever had the expression on their face before oh, say 1956 or so. Very "ironical"!
Well, it is interesting to wonder about who the next Pope will be, whoever it is, John Paul II will be a tough act to follow.