PHILADELPHIA - Embattled Boston archbishop Bernard Cardinal Law, under siege from the epic sex scandal threatening his 18-year legacy, will likely be replaced and sent to the Vatican by the beginning of June, according to sources. Law, who arrived in Newark, N.J., yesterday after the historic two-day conclave of American cardinals at the Vatican, will be reassigned by Pope John Paul II to an as-yet determined position prior to a scheduled deposition of Law in a legal suit against the archdiocese, according to church officials. ``There will be a promotion by June at the latest,'' said one source. ``They...