@rejectedndejected I, too, am applying to liturgical studies at Notre Dame. I had a phone meeting with one of the top professor in liturgical studies there a couple of months ago, and he told me that all LS students must know Greek, Latin, French, & German by the end of it. The LS track, he said, is heavily historical even if you want to end up focusing on liturgical theology or ritual studies at the end of the day. However, he made it sound like it's not unheard of for successful applicants only to have one of the aforementioned languages (or just partial competency in two or three of them...which is my case). Students who are lacking faculty in languages can arrive on campus early to do summer language course(s).
Beyond languages, he told me that LS gets about 24 applicants each year. They select four for campus visits and then offer two applicants admission.