The provisions of Sections 12-15-317 and 12-15-319 as amended by Act 98-370, regarding termination of parental rights petitions required to be filed by the Department of Human Resources shall apply to all children coming into foster care after April 22, 1998. In the case of children in foster care on April 22, 1998, the department shall comply with the timetable established by federal law for the processing of such cases.