Question re Residential College

My child was accepted last week, and had indicated she was interested in RC. On her online portal, the RC was listed in the notice of acceptance. However, the Admissions Office just informed us that this does not mean she is accepted to the RC, it means that the RC will consider her for admission, as long as she expresses continued interest (which she has done). Does anyone know how competitive the RC tends to be and what the likelihood might be of an acceptance, as well as when the final word might arrive? It would be good to manage expectations accordingly.