In response to the "diversity" comment... Leanid, good point about the nun in a formerly all-male place!
Our reaction, though, was that having a nun as the individual "welcoming" families to BC suggests that consciously or unconsciously, this is a message that Catholicism is the "face" of the school. In reading about BC, the wonderful Jesuit values were emphasized, but there was an impression that one could attend without being Catholic and still feel like you would fit in. That may be true, but the initial impression may make those not in the Catholic faith somewhat uncomfortable.
FWIW, I worked in a Catholic institution for years, so am aware that if you have not gone to Catholic schools, it can take some time to feel comfortable in an openly religious environment. This thread was about BC upping its game. If they want to do that, they may want to consider making it feel more accessible to those of other faiths.