update (08 Feb 2016): According to a statement by Home Affairs Director-General Mkuseli Apleni, the unabridged birth certificate (UBC) requirement for travelling minors is still being "strongly advised".
Department of Home Affairs - STATEMENT BY HOME AFFAIRS DIRECTOR-GENERAL MKUSELI APLENI FOLLOWING AN UPDATE SESSION WITH TOURISM STAKEHOLDERS, ON THE IMPLEMENTATION OF CABINET CONCESSIONS ON IMMIGRATION REGULATIONS, 5 FEBRUARY 2016, ACARDIA, PRETORIA
South Africa's Deputy President Cyril Ramaphosa confirmed at the National Assembly on Thursday (12 Nov 2015) that "minors travelling from visa-exempt countries will no longer need to produce an unabridged birth certificate and parental consent at South Africa's ports of entry. However, they will be required to provide documentation proving the relationship between them and the parent or guardian that they will be travelling with when entering South Africa. He further said it is strongly advised that minors should always travel with a proof of relationship and consent from absent parents or guardians in case they are asked to produce them at random.
No unabridged certificate for visa exempt countries
South Africam Tourism has released an infographic summarising the amendments made to South Africa's visa rules.