After receiving the report of the Charter Revision Commission as provided in Section 1203 of Article XII of this Charter, the County Council is hereby empowered by ordinance enacted by the affirmative vote of not less than five members, to revise, amend or reconstitute councilmanic districts then in effect but not to change the number thereof. Any such ordinance shall not be subject to executive veto and shall become law on the date of its enactment by the Council. Any such ordinance shall not be an emergency ordinance and shall be subject to the referendum provisions of Article III of this Charter.